asBEHAVE_VALUE_CAST now supports the generic form 'void f(?&out)'

git-svn-id: http://svn.code.sf.net/p/angelscript/code/trunk/sdk@1919 404ce1b2-830e-0410-a2e2-b09542c77caf
The value cast behaviour with var type works for conversions to primitives too

git-svn-id: http://svn.code.sf.net/p/angelscript/code/trunk/sdk@1920 404ce1b2-830e-0410-a2e2-b09542c77caf