Merge pull request #2596 from MartinNowak/metastrings

readd std.metastrings as deprecated module
Conflicts:
	posix.mak
	win32.mak
	win64.mak
Merge pull request #2610 from MartinNowak/2.066

Cherry-picks for 2.066.1
Merge tag 'v2.066.1' into ldc