Simplify UI scaling display quality options.
This removes three options:
* 'Use NN scaling at integer scales', as NN is decidedly preferable at integer scales.
* Anisotropic scaling, as it produces results very similar (if not equal) to linear scaling.
* NN as a selectable option in the dropdown - NN is forced on integer scales and unavailable for non-integer scales.
Refactor gUnk9DE568 and gUnk9DE56C to be type of rct_xy16 called gPaintSpritePosition
Rename unk_9ABDA4 to gCurrentColourPalette.
Rename gUnkEDF81C to gCurrentImageType.
Rename sub_679236_679662_679B0D_679FF1 to pixel_is_present.
Remove unused variables _unk9ABDAE, _unk9AC149, unk_9E3CE4, only ever assigned but never read.
Remove unreferenced variable unk_9E3CDC.
Clean up some parts in sub_679236_679662_679B0D_679FF1.
Remove function sub_68371D and references, it assigns variables that are never used.
Add assert determine if unused code.
Implement 'missing objects' window
Basic implementation of 'bad objects' window
Add new object_load_error.c
Add object_load_error.c
Faffing about
String stuff
Stuff
Get window basically displaying
Proper col header for object
Display object types
Display file name and explanatory message
Probably about time I added myself to the dev list
Cleanup and comments
Make bad object window work with SC6
Fix whitespace, string IDs, flip core function sense
Fix spacing in string_ids.h
Fix string ID snafu
Fix HasNoInvalidObjects() sense
Attempt to refactor this to pass data properly
Move typedefs to separate header
Fix up signatures
Add park_load_result_types.h
Clean up includes and remnants of prev implementation
Split duplication into function, free invalid entries list on close
Use pointer for object_validity_result param
Fixup string IDs
Use LoadObject() directly
Use dependency injection, fix string termination
Xcode fix, make helper function static
Fix buffer overrun and memory leak
Use SDL for clipboard functionality
Fix function & variable declarations
Rework editor_read_s6() to use new park load result type
Update changelog for #5624
[ci skip]
Fix mem leak, function signature and whitespace
Initial setup of xcode for multiple targets
libopenrct2 partially working
Restore macOS mach_info init
Get macOS OpenRCT2-ui working if hackish
Implement UiContext for macOS properly
Put tabbing cancellation code back