dengitor+assets+tests-v0.7.0

from git diff v0.6.0
this release has A LOT of changes over a couple of months

• wayland support (EXPERIMENTAL). Requires a very recent distribution
  that supports required wayland protocols such as arch. Force Wayland by
  setting -DDENGINE_WIN=WAYLAND
• Optimize event loop by using condition variables. This reduced CPU
  usage since event loop was wasting alot of CPU cycles by running
  infinately after window_createwindowandpoll in window.c
• Added Car physics test (really fun to crash this car joy). Also fixed
  broken bullet physics test
• Scene shadows now draw using back faces, glCullFace(GL_FRONT)
• Add pulseaudio NSL + stb_vorbis to decode an ogg file to play some
  audio (neeet!)
• Thread lock pushing to debug trace to avoid race condition see commit
  a378cee6c2f9df9173ecb7bd754f76cccbd46960
• fixed gamepad for Win32 and Linux
• Redirect stdout to file when starting logging thread
• Android immersive mode hacks using JNI
• check for pthread_types to avoid namespace pollution by including
  pthread.h
• Temux:X11 android support
• Force context or windowing with CMake option -DDENGINE_WIN or - DDENGINE_CONTEXT for Linux
• Exit if an OpenGL error occurs. Requires -DDENGINE_DEBUG_GL