libpixel (suprisingly) still compiles, but depends on libraries in a very annoying manner that makes EuropaTools hard to compile. Also, I don't like stb_image_write.
Replace it with some hand-done structs and the simpler/faster/better `lodepng`.
Also fix some warnings and potential issues that building the entire EuropaTools codebase under those flags showed.
Later on once we drop the libpixel and stbiw dependencies, we can probably turn on -Werror for release builds.
I have been preparing for this for a while. Instead of having a bunch
of strewn out utilities, let's just have one solid multitool
which is nice to use.
This commit also removes europa_pack_extractor, as it's now unnesscary
and replaced with a better utility, that does more.
Creation wasn't implemented yet, but I really need to sleep. It can be done later, and pakcreate can be used as a temporary stopgap.
Instead of using set_target_properties on all tool binaries,
instead we can use target_compile_features([xxx] PUBLIC cxx_std_20).
This properly alienates projects which depend on libeuropa, allowing the src/tools CMakeLists to be trimmed down quite a bit.
Also fixes a build break I accidentally introduced.
PakReader won't read everything in ReadData(), it now only reads the header and TOC.
Files now need to be read in separately.
Adds progress bar to europa_pack_extractor.
Moved code around.
