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We get a process quit event, which notifies us that we ourselves have quit.

To keep C struct initializer syntax sugar.

For overloading virtual function. Fixes clang warning.

Comment unused functions.

TODO: race condition: Pointer tip is sometimes 0 when render_thread tries to render

TODO: For some reason we get a shutdown event when another scene app starts while we are in scene mode.

Closes #5

Qt conflict with X headers

This is only be necessary for Ubuntu 18.04 compatibility where epoxy is too old.
In the future we will move creating external textures from an fd upstream into GLTexture.

v2: add function pointers to old_epoxy_compat.h

Makes steam menus usable with a VR controller.
Caveat: Steam menus won't attach to the steam window in VR when opened with the mouse on the desktop.