[Feature Request]: Upgrade SDL2-image

[tsunamistate]

Feature Type

Other (please specify)

Describe

Current SDL2-image used from source for platforms that don't use system package (such as Android) is 2.0.5, which is 3 years old at this point

DevilutionX/3rdParty/SDL_image/CMakeLists.txt

Line 23 in 21fc503

URL https://github.com/libsdl-org/SDL_image/archive/refs/tags/release-2.0.5.tar.gz

It also requires a workaround of IMG.c, which is no longer needed in recent versions, AFAIK

[AJenbo]

Are there any specific features of fixes that we would specifically benefit from?

[tsunamistate]

• Native CMake support
• New SDL-image uses stb_image as a default backend for PNG and JPG, so we can drop libpng dependency
• Updates to PNG decoding (example: PNG images with a palette are loaded as SDL surfaces with a palette from 2.8.0)