Fix WindowsGL project template : use the right Program Files folder and fix an issue with the resolving of assembly references finding the WindowsPhone ones before the Windows ones (error was MessageFilterHook type not found when launching a new WindowsGL project).
Fix assembly references for all project templates that were using MSBuildExtensionsPath instead of MSBuildProgramFiles32.
Implemented some of the basic functionality of XmlImporter.
More XmlImporter functionality.
Adding XML asset test case data and matching classes.
Saw a swizzle bug.
Merge pull request #2380 from SickheadGames/XmlImporter

Implemented basic XmlImporter functionality
Merge pull request #2104 from speps/develop

Fix WindowsGL project template : use the right Program Files folder and ...
Fixed remaining calls to target correct path to where MonoGame is installed.
Merge pull request #2407 from SickheadGames/msbuildpath

Followup To #2104
Merge back from develop, no-op