removed global object in SDL2 demo, more C++-friendly API#799

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Xeverous wants to merge 3 commits intoImmediate-Mode-UI:masterfrom

Xeverous:demo_sdl2_remove_global

Commits on Apr 1, 2025

removed global object in SDL2 demo, more C++-friendly API
Xeverous
committed

Commits on Apr 4, 2025

removed extra structs entirely in SDL2 example
Xeverous
committed

Commits on Apr 25, 2025

Removed helper structs and global sdl object in 3 SDL examples
Xeverous
committed