Added IsAnyMouseDown() helper. ...

Examples: DirectX9/10/11: Using IsAnyMouseDown() instead of local function.

Examples: Vulkan: Fix (something changed in GLFW not including vulkan.h, was unwillingly relying on that)

Merge branch 'context' ...

# Conflicts:
#	examples/allegro5_example/main.cpp
#	examples/directx10_example/main.cpp
#	examples/directx11_example/main.cpp
#	examples/directx9_example/main.cpp
#	examples/marmalade_example/main.cpp
#	examples/opengl2_example/main.cpp
#	examples/opengl3_example/main.cpp
#	examples/sdl_opengl2_example/main.cpp
#	examples/sdl_opengl3_example/main.cpp
#	examples/vulkan_example/main.cpp

Nav: Examples: Added commented out io.NavFlags |= ImGuiNavFlags_EnableKeyboard to all examples. (#787)

Nav: Keyboard is now automatically mapped based on io.KeyDown[]. (#787)

Added ImGuiKey_Space, mapped in every examples. Will be required for navigation. (#787)

Nav: Toward automatically mapping keyboard input. Renamed ImGuiNavInput_PadXXX to ImGuiNavInput_XXX. Renamed ImGuiNavInput_KeyXXX to ImGuiNavInput_KeyXXX_ (internal). (#787)

Merge branch 'master' into context

Examples: SDL+GL3: Added Navigation keyboard mapping. (#787)

Merge branch 'master' into navigation

Examples: SDL: Using SDL_GetPerformanceCounter() / SDL_GetPerformanceFrequency() to handle framerate over 1000 fps properly. Noticed bad inputs artefacts in Nav branch at 2000 fps without this. (#996)

Examples: SDL2: Enabling vsync. Using scancode consistently, fixed keyboard weirdness.

Examples: Organized header files to make available features more visible.

Merge branch 'master' into navigation ...

# Conflicts:
#	imgui.cpp

Fix iOS code; fixes entire XCode build for Apple example

Merge branch 'master' into context

Merge branch 'master' into navigation

Moved extra_fonts/ to misc/fonts/. Moved .natvis file to misc/natvis/ (#1569)

Merge branch 'master' into navigation ...

# Conflicts:
#	imgui.cpp

Examples: Apple: Tweak code and sync with other examples better (untested).

Examples: Using Dark theme by default. (#707). Tweaked demo code.

Examples: Tweaks formatting.

Merge branch 'master' into navigation

Examples: Using #include "imgui.h" instead of <imgui.h> appear correct-er as per standard? xcode+clang are very nitpicky there.

Examples: Makefile leave CXX alone, instead leave commented out options. (nb: codeship doesn't seem have clang++)

Examples: Use Clang in old Makefile.

Examples: Synced Makefile comments. Added build/ folder into git ignore list/

Examples: Apple: Fixed filenames in OSX xcode project.

Examples: Vulkan: FIxed warnings in 32-bit modes (vulkan uses VkDeviceSize which is always 64-bit long)

Merge branch 'master' into navigation