ImGui integretion: Implement mousewheel and mouse hover #10259

Job	Run time
build_test_headless_alpine	13m 56s
build-uwp	8m 42s
build-windows (x64)	9m 34s
build (ubuntu-latest, test, clang, clang++, ./b.sh --headless --unittest, clang-normal)	3m 52s
build-windows (ARM64)	10m 7s
build (ubuntu-latest, gcc, g++, ./b.sh --headless --unittest, gcc-normal)	3m 26s
build (ubuntu-latest, android, clang, clang++, cd android && ./ab.sh -j2 APP_ABI=arm64-v8a UNITTE...	10m 1s
build (ubuntu-latest, android, clang, clang++, cd android && ./ab.sh -j2 APP_ABI=armeabi-v7a UNIT...	8m 39s
build (ubuntu-latest, android, clang, clang++, cd android && ./ab.sh -j2 APP_ABI=x86_64 UNITTEST=...	10m 47s
build (ubuntu-latest, android, clang, clang++, cd android && ./ab.sh -j2 APP_ABI=arm64-v8a OPENXR...	8m 41s
build (ubuntu-latest, android, clang, clang++, ./b.sh --libretro_android ppsspp_libretro, android...	5m 12s
build (ubuntu-latest, qt, gcc, g++, ./b.sh --qt, qt)	3m 24s
build (ubuntu-latest, libretro, gcc, g++, make -C libretro -f Makefile -j2, gcc-libretro)	1m 42s
build (ubuntu-latest, libretro, clang, clang++, make -C libretro -f Makefile -j2, clang-libretro)	2m 41s
build (macos-latest, test, clang, clang++, ./b.sh --headless --unittest --fat --no-png --no-sdl2,...	9m 0s
build (macos-latest, ios, clang, clang++, ./b.sh --ios, ios)	3m 44s
test-windows	1m 7s
test (ubuntu-latest)	1m 17s
test (macos-latest)	1m 25s
	1h 57m 17s

Provide feedback