Add ImGui

[Sarroxxie]

Maybe add ImGui for Debugging purposes :)

[crykn]

If you want ImGui for making simple UIs in the g3d tests, then sure, feel free to do so. Adding one of the following JVM ports should do the trick: kotlin-graphics/imgui, ice1000/jimgui, SpaiR/imgui-java. See here for a simple guide.

However, I'm against adding it as a general dependency (for non-test parts). Depending on which port is used, ImGui's size is quite considerable, it is most certainly not compatible with GWT (--> Kotlin) and the capabilities of libgdx' Scene2D.UI are at least somewhat comparable in regards to quickly prototyping GUIs.

[crykn]

For now, there's a quick prototype of ImGui support over at: https://github.com/eskalon/ProjektGG/blob/03573d06c607a8c15256f50e38715e7c682d09f8/game/src/main/java/de/gg/game/misc/ImGuiRenderer.java