Add support for VC11 and VC12

[timpokorny]

Story

{As a} Windows C++ developer, {I want} support for VC11 (2012) and VC12 (2013), {So that} I can use a somewhat modern compiler!

Context

I've had a couple of requests for Visual Studio 2012 and 2013 recently. It has been some time since we adjusted the Visual Studio compiler support, so now seems like as good a time as any to readjust!

Not sure if we'll have any issues with the older HLA v1.3 interface in the face of modern C++ 11/12 compiler standards. Only one way to find out.

Acceptance Criteria

Once complete I shall be able to:

• [ ] Compile and link my VC11 federates directly against a VC11 compiled Portico library
• [ ] VC11 libraries and DLLs added to the main release package
• [ ] Compile and link my VC12 federates directly against a VC12 compiled Portico library
• [ ] VC12 libraries and DLLs added to the main release package
• [ ] Build VMs updated with VC11 and VC12 compiling capabilities

[timpokorny]

Added VC12 to the mix as well. Combine with the deprecation task this will give us 2010 for legacy and 2012/2013 for current users. Will not yet add 2015 - no requests and a bit early.