Add {Library} to project files

This allows more platform independent project files.

On windows this is {Application}/Libraries and on mac/linux this is {Application}/lib Another option is to let {Library} represent Libraries on windows and lib on mac/linux.

I also propose to add an alias for {OS} that expands to some unique operating system and platform identifier. In this way you can OS agnostically encode this as well. It might be the case that a {Platform} is also required (e.g. arm/x86)

The paths for cpm would then change from

		Path:	{Project}*cpm
		Path:	{Project}*cpm*Posix
		Path:	{Project}*Pm
		Path:	{Project}*Unix
		Path:	{Project}*Util
		Path:	{Project}*BatchBuild
		Path:	{Project}*Interfaces*LinkerInterface
		Path:	{Application}*lib*ArgEnv
		Path:	{Application}*lib*StdLib
		Path:	{Application}*lib*Directory

to something like:

		Path:	{Project}*cpm
		Path:	{Project}*cpm*{OS}
		Path:	{Project}*Pm
		Path:	{Project}*{OS}
		Path:	{Project}*Util
		Path:	{Project}*BatchBuild
		Path:	{Project}*Interfaces*LinkerInterface
		Path:	{Library}*ArgEnv
		Path:	{Library}*StdLib
		Path:	{Library}*Directory