Visual Studio 2015 support

[riza]

To support to Visual Studio 2015 (VS 2015), this ticket will introduce these files:

- Solution file : pjproject-vs14.sln
- Project files : *.vcxproj
- Project properties sheet files : *.props
- Project filter files : *.filters

Please note that in VS 2015, VC++ directories settings are available in the user property sheet.

To include them in a global setting, use Microsoft.cpp.<Platform>.users (e.g: Microsoft.Cpp.Win32.user) properties sheet file.

[riza]

In 5168:

Re #1881: Add Visual Studio 2015 support.

[nanang]

In 5169:

Re #1881:

• Updated build output naming 'vc8' -> 'vc14' for VS2015.
• Fixed miscelaneous warnings in VS2015 project settings.
• Updated SVN ignore property.

[nanang]

In 5170:

Re #1881: Fixed compile warnings on VS2015 about declaration hides previous declaration.

[nanang]

In 5172:

Re #1881: Removed WM5 & WM6 target from VS2015 solution, also fixed libmilenage not included in some build configs.

[nanang]

In 5175:

Re #1881: Minor update on pjlib-util project to use default target platform version.

[riza]

In 5181:

Re #1881: Add filters file.