Examples: Added 64-bit projects for MSVC

Examples: Moved GLFW/GL3W to a common libs/ folder

Examples: Updated to GLFW 3.1

Added io.KeyAlt + support in examples apps ...

Currently unused but supported by sample so that more people will have
it set up when menus needs them

Examples: reference implementations honors drawlist user callbacks.

Examples: README direct the user to the opengl_example

Examples: OpenGL 2/3 examples cleanup to match DirectX9/11 structure.

Examples: DirectX9 example cleanup to match DirectX11 structure.

Examples: DirectX11 example application handles window resizing.

Examples: DirectX9 example application handle window resizing.

Examples: Fixed readme file.

Examples: Refactored directx11_example to be easier to copy & paste into user application.

Examples: Clang warning fix.

Examples: Makefile fixes.

Examples: Clang/Linux warning fixes.

Examples: Tweaks.

Examples: Refactored directx9_example to be eaasier to copy & paste into user application.

Examples: shallow tweaks to match upcoming other examples.

Examples: Rename globals again

Examples: Moved gl3w to opengl3_example directory + fixed msvc project paths

Examples: Makefile

Examples: Rename global to be more consistent

Examples: Refactored opengl3_exapmle into a glfw specific file that can be copied and pasted

Examples: Refactored opengl_example into a glfw specific file that can be copied and pasted. ...

Other examples will follow.

Examples: DirectX examples uses WM_KEYDOWN/WM_KEYUP ...

Fixes pressing Enter in IME being caught by application right after
validating an IME input.

Windows: setup a default handler for ImeSetInputScreenPosFn so IME (Japanese/Chinese) inputs are positioned correctly. ...

User need to set io.ImeWindowHandle

Examples: Windows examples don't link with imm32.lib by default.

Examples: Speculative Makefile fix. I should get a Linux box instead on relying on Jenkins, this is pretty embarrassing.

Examples: Fix Makefile

Examples: Fix OpenGL3 example Makefile