Web GUI now uses Chromium Embedded Framework.

Mostly works. On Linux there is annoying bug that causes X errors due to
excess mouse movements. It might be tied to GTK+ version.

Also inadvertently fixes upstream issue #80.
Merge branch 'develop' into cef

Conflicts:
	src/main.cpp
Updated the README.

* New asset package.
* Typo.
Merge branch 'develop' into cef

Conflicts:
	CMakeLists.txt
	src/systems/WebGUISystem.cpp
Merge branch 'develop' into cef

Conflicts:
	CMakeLists.txt
	README.md
	include/components/WebGUIComponent.h
	include/systems/WebGUISystem.h
	src/systems/WebGUISystem.cpp
Fixed some obnoxious errors.
Merge branch 'cef' of https://github.com/danix111/Sigma into danix111-cef

Fixed not generating texture on WebGUIComponent creation.

Conflicts:
	CMakeLists.txt
	include/systems/WebGUISystem.h
Added a catch in InjectMouseMove to prevent a crash if an event is sent before browsetHost is initialized
Merge branch 'danix111-cef' into develop