Implement python Function methods to rust

Squashed:
add Function::add_tag method
add Function::{add_user_code_ref,remove_user_code_ref} methods
add Function::{add_user_type_field_ref, remove_user_type_field_ref} methods
add Function::{add_user_type_ref, remove_user_type_ref} methods
add Function::apply_auto_discovered_type
add Function/MediumLevelILFunction user_var_values and related functions
simplify UserVariableValues::values_from_variable
cargo fmt fix
fix doc and QualifiedName params
fix MediumLevelILFunction::is_var_user_defined parameter
Remove unecessary Safety comment
add Function::{create_auto_stack_var,delete_auto_stack_var} methods
add MediumLevelILFunction::create_auto_var method
move Function::{create_auto_stack_var,delete_auto_stack_var} methods to MediumLevelILFunction
add MediumLevelILFunction::{create_user_stack_var,delete_user_stack_var} methods
add Function::block_annotations method
add Function::{call_stack_adjustment, call_type_adjustment} method
add Function::{constant_data, constants_referenced_by, constants_referenced_by_address_if_available} methods
add Function::function_tags method
add Function::{indirect_branches, indirect_branches_at} methods
add Function::instr_highlight method
add Function::instruction_containing_address method
add Function::{int_display_type,int_enum_display_typeid,int_display_type_and_typeid} methods
add MediumLevelILFunction::{var_refs, var_refs_from} methods
add Function::{parameter_at, parameter_at_low_level_il_instruction} methods
rebase GAT changes
add Function::{reg_value_at, reg_value_after, reg_value_at_exit} methods
Add alpha to HighlightColor::NoHighlightColor
add Function::{regs_read_by, regs_written_by} methods
add Function::{stack_contents_at, stack_contents_after} methods
add Function::{stack_vars_referenced_by, stack_vars_referenced_by_address_if_available} methods
add Function::{tags_at, tags_at_range} methods
add Function::type_tokens method
add Function::variables method
add Function::{is_call_instruction, is_var_user_defined} methods
add Function::{mark_updates_required, mark_caller_updates_required, mark_recent_use} methods
add Function::{merge_vars, unmerge_vars, split_var, unsplit_var} methods
add Function::reanalyze method
add Function::request_debug_report method
add Function::remove_tag method
add Function::remove_tags_of_type method
add Function::analysis_performance_info method
add Function::call_sites method
add Function::caller_sites method
add Function::{calling_convention, set_calling_convention} methods
add Function::{can_return, set_can_return} methods
add Function::comments method
add Function::{clobbered_regs, set_clobbered_regs} methods
add Function::{has_explicitly_defined_type, has_user_annotations, has_user_type, has_variable_arguments} methods
fix Function::set_can_return_user function
add Function::{high_level_il_if_available, medium_level_il_if_available, low_level_il_if_available, lifted_il_if_available} methods
add Function::{global_pointer_value, has_unresolved_indirect_branches} methods
add Function::lowest_address method
add Function::{inline_during_analysis, set_auto_inline_during_analysis, set_user_inline_during_analysis} methods
add Function::{is_pure, is_too_large, is_update_needed} methods
add Function::{provenance, stack_adjustment, set_user_stack_adjustment, set_auto_stack_adjustment} methods
add Function::{set_user_pure, set_auto_pure} methods
add Function::set_auto_type method
add Function::{return_regs, set_return_regs} methods
add Function::{set_auto_return_type, set_user_return_type} methods
add Function::unresolved_stack_adjustment_graph method
add Function::create_graph method
add Function::tags method
add Function::split_variables method
add Function::{reg_stack_adjustments, set_reg_stack_adjustments} methods
add Function::{mapped_medium_level_il, merged_variables} methods
add Function::{set_auto_instr_highlight, set_user_instr_highlight} methods
add stack_adjustments methods
add Function::set_user_call_stack_adjustment
add Function::set_auto_call_stack_adjustment
add Function::call_type_adjustment
add Function::set_user_call_type_adjustment
add Function::set_auto_call_type_adjustment
add Function::call_reg_stack_adjustment
add Function::set_user_call_reg_stack_adjustment
add Function::set_auto_call_reg_stack_adjustment
add Function::call_reg_stack_adjustment_for_reg_stack
add Function::set_user_call_reg_stack_adjustment_for_reg_stack
add Function::set_auto_call_reg_stack_adjustment_for_reg_stack
add Function::set_user_reg_stack_adjustments
add Function::set_auto_reg_stack_adjustments
add Function::set_auto_reg_stack_adjustments
add Function::set_auto_calling_convention method
add Function::set_auto_can_return method
add Function::{set_user_has_variable_arguments, set_auto_has_variable_arguments} methods
add Function::{set_user_indirect_branches, set_auto_indirect_branches} methods
add Function::set_int_display_type method
add Function::{set_user_parameter_variables, set_auto_parameter_variables} methods
fix documentation
add Function::unresolved_indirect_branches method
add Function::mapped_medium_level_il_if_available method
change methods `Function::{set_user_type, set_auto_type}` to receive `&Type`
merge RegisterList and RegisterSet into CoreRegister impl
fix function names
fix function names
fix documentation syntax
fix documentation syntax
fix Function documentation by adding MediumLevelILInstruction::get_split_var_for_definition
fix documentation links
rename `VariableDefinitions` to `MediumLevelILInstructionList`
fix `PossibleValueSet` switched `NotInSetOfValues` and `ReturnAddressValue`