Examples: Simplified GLFW keyboard callbacks

Merge branch 'master' of https://github.com/Roflraging/imgui into Roflraging-master

Simplified glfw keyboard callbacks.

Merge remote-tracking branch 'origin' into 2015-04-indexed-rendering ...

Conflicts:
	examples/directx11_example/imgui_impl_dx11.cpp
	examples/opengl3_example/imgui_impl_glfw_gl3.cpp

Examples: OpenGL3: Tweaks (argh, github ui)

Examples: OpenGL3: Tweaks.

Indexed rendering. Not in main branch because breaks rendering code too much. Will merge in trunk along with more major graphics changes lat

Fixed modifier key state setting in GLFW callbacks.

Examples: initializing float + missing comment.

Comments on font loading, fixed commented out paths and added DroidSans in the list

Examples: Terser code + added commented out glUseProgram(0( suggestion in OpenGL2 sample.

OpenGL/GLFW: hide system cursor if imgui is soft-rendering cursor

typo ImGui_ImplGlfwGL3_KeyCallback()

Examples: uses SetNextWindowPos/SetNextWindowSize when applicable

Removed extraneous spaces

opengl3+opengl example: if content window doesn't have focus, tell ImGui we don't have a mouse position. e.g. avoids tooltips popping up in imgui app when you're interacting with a different app window that overlaps it.

Examples: Fixed Makefile

Examples: Fixed Makefile

Examples: MSVC: increase warning level from /W3 to /W4 for OpenGL examples

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

Examples: Clang warning fix.

Examples: Makefile fixes.

Examples: Clang/Linux warning fixes.

Examples: Tweaks.

Examples: shallow tweaks to match upcoming other examples.