MGCB project:
-changed target framework from .net40 to .net45
-changed target platform from AnyCpu to AnyCpu Prefer 32-bit
Note that we actually want MGCB to be x86 but it still has some dependences on native 3rd party assemblies which are x86.

Pipeline Solution:
Added MGCB project.

Pipeline project:
-added reference to MGCB project
Pipeline needs this in the output directory in order to perform builds
-changed target platform in debug configuration from AnyCpu to AnyCpu Prefer 32-bit
Note this matches the release configuration plus allows edit and continue.

ContentItem.Processor.cs:
No functional changes, removing unused code and whitespace changes only.