Viewport: Misc tweaks.

Examples: Vulkan: Fixed some minor discrepency in the SDL+Vulkan example to match the Glfw+Vulkan example. (cc #2097)

Nav: Use Platform_SetWindowFocus when CTRL+Tabbing to another viewport.

ImDrawList: Fixed AddConvexPolyFilled() undefined behavior when passing points_count smaller than 3, in particular, points_count==0 could lead to a memory stomp if the draw list was previously empty.

Viewport: GLFW: Build fix for pre GLFW 3.2 (#1542)

Examples: Referring to missing gamepad support in back-end that are missing it.

Viewport: Enabled viewports by default in more example apps.

ArrowButton(): Fixed arrow shape being horizontally misaligned by (FramePadding.y-FramePadding.x) if they are different. ...

Demo: Added extra usage of AlignTextToFramePadding() in a more visible section.

Contributing, Issue Template

Added Fonts readme details and links to Sweet16 font. (#2085)

Fix file names (#2083)

Viewport: Increased threshold for setting ImGuiViewportFlags_NoFocusOnAppearing. (#1542), 2 doesn't seem enough with some docking setup.

Merge branch 'master' into viewport ...

# Conflicts:
#	examples/imgui_impl_dx9.cpp
#	examples/imgui_impl_opengl2.cpp
#	examples/imgui_impl_opengl3.cpp
#	examples/imgui_impl_vulkan.cpp

BeginMenu(): Fixed menu popup horizontal offset being off the item in the menu bar when WindowPadding=0.0f.

ColorPicker: Replaced the Separator with a Spacing call. (#2068)

Viewport: Fix an issue introduced on ~August 16, which would assert when viewport are disabled. Also made the DestroyPlatformWindow process more sturdy. (#1542)

Examples: Using "dear imgui" terminology in all examples headers/comments + fix minor typo.

Fix MSVC's C4312 warning about casting user texture type to void* in ImageButton (#2080)

Internals: Replace unsigned short with ImWchar when dealing with character storage (missing cases) + in imgui_impl_ file keep using neutral type everywhere, added missing explicit cast in three bindings. (#2078)

Internals: Replace unsigned short with ImWchar when dealing with character storage. (#2078)

Nav: Added a way for code to cancel Alt for menu toggle (ImGuiNavInput_KeyMenu_). Cancelling out on platform window. close request. (#1542, #787)

Merge branch 'master' into viewport ...

# Conflicts:
#	imgui.cpp
#	imgui_internal.h

DragFloat: Disabled using power curve when one edge is FLT_MAX (broken in 1.61). Disabled setting a default drag speed when one edge is FLT_MAX. (#2024)

DragFloat: Fixed a situation where dragging with value rounding enabled or with a power curve erroneously wrapped the value to one of the min/max edge. (#2024, #708, #320, #2075).

Nav, Focus: Fixed ImGuiWindowFlags_NoBringToFrontOnFocus windows not being restoring focus properly after the main menu bar or last focused window is deactivated.

example_glfw_vulkan was missing a reference to imgui_widgets.cpp (#2071, #2036)

Fixed calling SetNextWindowSize()/SetWindowSize() with non-integer values leading to accidental alteration of window position. We now round the provided size. (#2067)

Fixed calling DestroyContext() always saving .ini data with the current context instead of the supplied context pointer. (#2066)

Version 1.66 WIP

Merge branch 'master' into viewport ...

# Conflicts:
#	imgui.cpp