Simplified the CFileSystem a bit (no longer does it do pattern matching when enumerating files/directories)

git-svn-id: http://svn.code.sf.net/p/angelscript/code@2064 404ce1b2-830e-0410-a2e2-b09542c77caf
Documenting the syntax in BNF

git-svn-id: http://svn.code.sf.net/p/angelscript/code@2065 404ce1b2-830e-0410-a2e2-b09542c77caf