Separation project for the NET and GamerServices namespaces
All .NET and .GamerServices files and references moved to new .NET libraries for all platforms

Fully tested on all platforms
Issues logged for code comments:
* #2510 Android platform calls Net.Session.Exit in AndroidGamePlatform.cs
* #2511 OpenTKGamePlatform has been updated and calls Net.Session.Exit
* #2512 iOS platform calls Guide.Initialise in iOSGamePlatform.cs
* #2513 PSM platform calls Net.Session.Exit in PSSGamePlatform.cs

.gitignore updated to ignore the new .NET .csproj files
GUID generated for new projects
Updated .gitignore to something more generic as requested
Update Mac platform, logged another issue:
#2515 MacOS platform Uses GamerServices in MacGamePlatform.cs
Fixed referencing issue for MacOS platform n the FrameworkDefinitions.NET
Replaced iOS.NET GUID
Excluded Web from .NET lib
Hook up Javascript implementations to JSAPI class

To enable this to work, developers need to modify the default index.htm generated by Protobuild to have:

        manifests: [
          "MonoGame.Framework",
          "JSILPort.exe"
        ],

This will cause the appropriate MonoGame libraries to load.
Fixed the MonoGame documentation style for embedding into the website.
Merge pull request #2517 from hach-que/web-api-working

Hook up Javascript implementations to JSAPI class
Removed Lidgren as a dependency for the pipeline builds since it is no longer part of the main platform
Implement game tick for Web platform

This hooks up the game's update and render loop for the Web platform, using
window.setTimeout to drive the loop behaviour.

Currently it always renders red when the graphics device is cleared, but this
is temporary.
Include JSAPIAccess in project definition
Merge pull request #2519 from hach-que/web-tick

Implement game tick for Web platform
Replaced whole inclusions with platform specific exclusions
TOC no longer shows any scrollbars.
Change of content or TOC size will update the window scrollbar.
When changing content we now scroll to the top of the page.
Removed C++ from syntax examples.
Updated copyright headers on the MonoGame style.
Added some consistent padding to the bottom of the TOC and content.
Retry to exclude web platform from .NET solution
Fixed and simplified section toggles.