Examples: Removed unused variable (will be used in docking branch tho, undo when merging!)

Merge branch 'standalone-emscripten' of https://github.com/nicolasnoble/imgui

Adding standalone Emscripten example.

Internals: Moved resize grips and borders to nav layer 1 so that testing system doesn't attempt to scroll to get them inside the InnerRect.

Tests: Added hook/tweaks for imgui-test engine. + Fixed warnings.

PlotLines, PlotHistogram: Ignore NaN values when calculating min/max bounds. (#2485)

Internals, Docs: Added a bunch of clarification about ButtonBehavior in the form of a table (and to facilitate writing tests)

Internals: Merge minor things from range_select branch. Added ImGuiButtonFlags_NoHoveredOnNav. Added IsItemToggledSelected() - unused here. Renaming.

Demo: Comments, tweaks, removed some uses of ImColor helpers.

Examples: Null: Added Makefile.

Internals: Selectable: Added ImGuiSelectableFlags_AllowItemOverlap in imgui_internal.h (~ #684, #2341)

Internals: Tweak ItemSize calls. Added todo items.

Examples: Makefile: Tweaks so they are more consistent with each others. Added -g./opt/local includes for MacPorts on Mac OS X. (#297)

Examples: Vulkan: Fixed warnings. (#2480)

Merge branch 'vulkan_fix_master'

FAQ tweaks. Add missing entries in imgui.cpp (which until now where only in the README).

Vulkan: Fix not incrementing semaphore index. (#2472, #2071)

Vulkan: Bits. Using IM_ALLOC/IM_FREE instead of new[] / delete[].

Misc: Added IM_MALLOC/IM_FREE macros mimicking IM_NEW/IM_DELETE so user doesn't need to revert to using the ImGui::MemAlloc()/MemFree() calls directly.

Misc: Added IM_MALLOC/IM_FREE macros mimicking IM_NEW/IM_DELETE so user doesn't need to revert to using the ImGui::MemAlloc()/MemFree() calls directly.

Vulkan: Removed superfluous vkInstance parameters being passed along.

Vulkan: Removed requirement for user to pass their own render buffer storage to ImGui_ImplVulkan_RenderDrawData(), this is managed internally.

Vulkan: Added ImageCount to InitInfo structure (!= MinImageCount) will be needed for viewports. Renamed FramesQueueSize -> ImageCount. (#2472, #2071)

Vulkan, Viewports: Fix for resizing viewport windows crashing. (#2472)

Vulkan: Renaming demo/helper structures. Tidying up examples main.cpp.

Vulkan: Renaming, we want InitInfo to source MinImageCount which is the "source" value (so viewport creation can use this). Made ImGui_ImplVulkan_DestroyFrameRenderBuffers public. (#2071)

Vulkan: Storing user info into a single g_VulkanInitInfo structure to simplify code.

Vulkan: Added extra parameter to ImGui_ImplVulkan_RenderDrawData(). User is in charge of owning/storing 1 ImGui_ImplVulkan_FrameRenderBuffers per in-flight rendering frame. Removed ImGui_ImplVulkan_SetFramesQueueSize. (#2461, #2348, #2378, #2097, #2071, #1677)

Vulkan: More renaming. Comments.

Examples: Vulkan: Merged helpers into ImGui_ImplVulkanH_CreateWindowData. Removed ImGui_ImplVulkan_InvalidateFrameDeviceObjects from API. Comments. (#2071)