[WP8] Set the correct GraphicsProfile and FeatureLevel
Remove member _featureLevel.

Remove member _featureLevel.

The only places it's used is when we update it and right after that it's
used to set the GraphicsProfile. There is no reason to keep a  local
copy. It can always be accessed via _d3dDevice.FeatureLevel.
Replaced licenses.
Replaced #if-#elif logic in default Framework.Media classes.
First run at reorganizing Song.cs and MediaPlayer.cs on a per-API basis.
Merge branch 'develop' into MediaPlayerSplit
Removed iOS code from Song.cs
Removed duplicate methods contained in the Linux path.
Merge branch 'develop' of https://github.com/mono/MonoGame into reloadAssetLinkFix
Reload asset link fix
Improved comment about the link hack
Removed duplicate destructor.
Merge branch 'develop' into MediaPlayerSplit
Linux fix.
Merge pull request #2292 from nkast/tnc_WP_SetFeatureLevelAndGraphicsProfile-

[WP8] Set the correct GraphicsProfile and FeatureLevel
Merge pull request #2303 from azchohfi/reloadAssetLinkFix

Reload asset link fix
Removed SpriteBlendMode.cs
Merge pull request #2316 from sys27/develop

#2315 Removed SpriteBlendMode.cs
Removed old "Libs" submodule.
Added new dependencies submodule.
Updated all references from ThirdParty/Libs to ThirdParty/Dependencies.