[Errors] Make internal and add friend assembles

[Errors] Make internal and add friend assembles

- Added Tizen.Applications and Tizen.Network as friend
  assemblies.

- Visual studio will now give warnings such as:
  warning CS0436: The type 'Interop' in 'Z:\work\csapi\application
  \Tizen.Applications\Interop\Interop.AppControl.cs' conflicts
  with the imported type 'Interop' in 'Tizen.Internals,
  Version=1.0.0.0, Culture=neutral, PublicKeyToken=6bd6425c835e8fd7'.
  Using the type defined in 'Z:\work\csapi\application
  \Tizen.Applications\Interop\Interop.AppControl.cs'.

Signed-off-by: Sidharth Gupta <sid92.gupta@samsung.com>
Change-Id: Ie8c141733048b1079be089933e6c4c32546209c4