Implemented several methods necessary for copying between bitmaps. Note: only copying between two PixelBitmapContent<T> where T is the same type has been implemented.
Added missing implementation for BitmapContent.ToString()
GraphicsUtil.CompressTexture no longer throws an exception for non-pow2 dxt textures if the GraphicsProfile is HiDef (this matches original XNA behavior).
TextureProcessor tries to set its pixel data to _bitmap. Bitmap only exists if the texture was loaded by the TextureImporter and even in that situation the pixeldata was already setup.
Merge pull request #2527 from SickheadGames/SpriteSheetProcessorFixes

BitmapContent.Copy, PixelBitmapContent.CopyTo
Correctly set TouchCollection.IsConnected based on TouchPanelCapabilities.IsConnected (not that that is correct yet).

Fixes #2531
Windows TouchPanelCapabilities MaximumTouchCount/IsConnected detection.
Android TouchPanelCapabilities MaximumTouchCount/IsConnected detection. These are sort of wrong due to API limitations, 2 means 2-4, 5 means 5+
Tidy up licence and usings in this file
iOS maximumTouchCount support. Harded coded values as found on google.
Linux and Mac have no touch support for now.
Touch count support for windows phone and PSM. PSM is just made up for now.
Since I've touched almost every line in here, white space cleanup.
FreeImage.GetBitmap() doesn't support images that are >32bpp. The image is now converted if necessary.
Cleaning up unmanaged resources.
Merge pull request #2535 from SickheadGames/FixFBitmap

>32bpp Image Fix
MGCB will now remove readonly attribute on the destination file for a copy build item.
PipelineTool now properly unescapes all xml string data it reads while importing a project.
Merge pull request #2536 from SickheadGames/UnescapePaths

Unescape import project paths, clear readonly flag on copy items.
Improved editing of OutputDirection/IntermediateDirectory. Showing a better editor dialog and also making the selected folder path relative to the project location when it is assigned.
Merge branch 'develop' into PipelineToolFolderDialog
Merge pull request #2537 from SickheadGames/PipelineToolFolderDialog

Improved 'choose folder' dialog.
Revert TouchCollection constructor back to XNA4 spec. TouchCollection.IsConnected now just proxies to TouchPanel.GetCapabilities().IsConnected
Moved docs to interface definitions and improved them.