Fixed leaked subscription AndroidGameActivity.Paused/Resumed inside AndroidGamePlatform ctor.
SwapChainRenderTarget  leak resources.

This one leak windowHandle resources. ('User objects' at Task Manager).
After 10000 or so the App crash.

`SharpDX.Utilities.Dispose()` can't be used on `_swapChain`, maybe
remove `readonly` modifier?
Reduce Garbage on TouchPanelState.GetState()

-Reduce the garbage generated by  TouchPanelState.GetState() .
GetState()  was generating garbage at a constant rate of 12Bytes/Frame.
Remove readonly & call SharpDX.Utilities.Dispose() on _swapChain
Merge pull request #2901 from nkast/SwapChainRenderTarget_UserOBjectsLeak

SwapChainRenderTarget  leak resources
Merge pull request #2902 from nkast/tncTouchCollectionEmpty

Reduce Garbage on TouchPanelState.GetState()
Adding Debug Display String (no quotes) To all major math types.  Complex types have labels to help guide the user to understand the data quickly at a glance.
Updated a few missing parens and  Annotations.
Add XML docs for a few items in GameComponentCollection. Not sure if the second sentence in ClearItems is needed or is obvious.
Added XML docs for several items in Rectangle.
Fix typo in pipeline tool page.
Updated welcome.md

To include instructions on how to edit the documentation.
Merge pull request #2907 from craftworkgames/develop

Updated welcome.md
Merge pull request #2904 from GhostTap/MoreReadbleDebugDisplayMathTypes

More readble debug display math types
Merge pull request #2894 from Andreyul/AndroidGamePlatformLeak

Fixed leaked subscription AndroidGameActivity.Paused/Resumed inside AndroidGamePlatform ctor
Updated Pipeline so that changes to this value will trigger a SaveEnabled. This is needed in order to properly change the TextureFormatValue of a Sprite Font Description item.
Simplify Rectangle.Point's remarks section in XML docs.
Reusing the already existing Property Value Changed handler.
Removing extra checks, If the value was the same, the event would not be firing here anyway.
Removing unused variables.