Examples: SDL+DX11: Changelog, readme, batch files, fixed vcxproj, minor stylistic fixes + minor sync of other main.cpp files. (#2632)

Synced/merged minor cruft from docking branch to minimize drift. AFAIK the only meaningful no-op change is that the call UpdateHoveredWindowAndCaptureFlags() was moved above UpdateMouseMovingNewFrame() to match what docking branch has been doing for a while.

Internals: Fixed Navigation from reaching ImGuiItemFlags_Disabled items (#211) + Examples comments

Examples: Win32+DirectX: moved helper functions below main.

Examples: DirectX9: Minor changes to match the other DirectX examples more closely. (#2394)

Removed trailing spaces (#2038, #2299)

Examples: Win32: Using wc.lpszClassName instead of duplicating the literal. + tweak README format.

Examples: Setting up style before bindings, so in complex binding (vulkan/dx12) it isn't miles away from the context creation.

Examples: Misc comments mainly related to GLFW callbacks. (#1759)

Examples: DirectX10, DirectX11: Removed seemingly unnecessary calls to invalidate and recreate device objects in the WM_SIZE handler. (#2088)

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

Examples: Using fully qualified "Dear ImGui" name in window titles.

Examples: Tweaked the main.cpp example structure for all examples. (There are a few hidden agendas here: 1) I would like to avoid encouraging people from using the implicit "Debug" window, and promote using Begin/End. In spite of my best attempt, there are a few feature of the upcoming docking system that cannot work 100% properly for the implicit Debug window, so future proof let's not put that feature in the spotlight too much for new users. 2) Moved dumb hardcoded positions into a single spot that can be replaced with a viewport relative position and not affect other demo windows. 3) Calling ShowDemoWindow before anything else, also for the benefit of a specific docking demo which will have an ordering constraint which is not really problematic in a real app but shouldn't be put forward in the demo.

Examples: Renamed example folders. (#1870)