ref #15 restructure examples:
* add project folder
* remove subdirectories (source/include)
* simplify example cmakes (no variables)
* unset sources and headers vars in glow cmake
* introduce new name convention for examples
ref #15 remove internal and enforce some style guides:
* pragma once in first line
* explicit glow namespace in sources
* include sequence: stl, gl, glm, ..., header, glow
ref #15 add missing files ...
ref #15 major performance boost
ref #15 add context format
ref #15 add screen info class
* implement getNumScreens
ref #15 add more screen infos for windows
ref #15 start on window class (windows for now)
ref #15 fix window proc redirect
ref #15 fix window style and windowed toggle
ref #15 add virtual window event handlers, revisit changing display settings
ref #15 add WindowEventHandler
ref #15 start on context and add example
ref #15 implement basic context creation and example
ref #15 restructure window (creates context now) and event dispatching - works fine now
ref #15 cleanup context example, add comments, start on handling key events ...
fix #15 destroy window and context, add exit on escape
ref #15 restrucuture event handling:
* support multiple windows
* allow single eventhandler for multiple windows
* allow individual eventhandler for each window
* revisit event related naming
ref #15 rename and add examples for single and multiple context initialization
ref #15 fix fullscreen-windowed toggle