YES_IMGUIFREETYPE is broken

[Flix01]

Basically now when we define YES_IMGUIFREETYPE and (link to libfreetype2), we see something like this:

(the strange thing is that the freetype font works... but everything else is broken).

[Flix01]

• addons/imguiyesaddons/imguifreetype.h/cpp have been REMOVED!!!

• Please use the new Dear ImGui definition IMGUI_ENABLE_FREETYPE instead (and link to libfreeetype).

• When using _imguiuser.h/.inl in this repository, _misc/freetype/imguifreetype.cpp will be automatically compiled for you.

• A global variable named gImGuiDefaultFontBuilderFlags can be used to set ImGuiFreeTypeBuilderFlags in advance too (please see the main function in examples/addons_examples/main.cpp).

Closing this.