Improved compiler error messages

git-svn-id: http://svn.code.sf.net/p/angelscript/code/trunk/sdk@1968 404ce1b2-830e-0410-a2e2-b09542c77caf
Improved compiler error messages

git-svn-id: http://svn.code.sf.net/p/angelscript/code/trunk/sdk@1969 404ce1b2-830e-0410-a2e2-b09542c77caf