Add tasks/targets for moonlight msbuild project support.

Add tasks/targets for moonlight msbuild project support.

In class:

	* Makefile: Add Moonlight.Build.Tasks to net_2_0_dirs and
	net_3_5_dirs.
	* Moonlight.Build.Tasks: New.

In class/Moonlight.Build.Tasks:

	* Initial commit.

In class/Moonlight.Build.Tasks/Moonlight.Build.Tasks:

	* CreateTestPage.cs:
	* GenerateMoonlightManifest.cs:
	* GetMoonlightFrameworkPath.cs:
	* GenerateXap.cs:
	* Respack.cs:
	* XamlG.cs:
	MSBuild tasks for building silverlight projects.

In tools/xbuild:

	* xbuild/Microsoft.Silverlight*.targets: New.
	* Makefile: Update to install silverlight target files.
	* xbuild_targets.make: Update to handle silverlight
	target files.

svn path=/trunk/mcs/; revision=155326