pngenc hle (#3957)

* PngEnc hle

* format

* formatting + fix scePngEncDelete

* fix cmake + misc improvements

i think the setjmp is right according to the libpng manual, works fine from my testing

* fixes

fix an issue with how alpha was handled, and PngEncode() now properly sets the processed_height in outputInfo.

* format

* Update pngenc.cpp

* set outputInfo->processed_height during png write

i assume some games will use this for error handling