Added helper methods to check if a type is a reference.
Added helper methods to check if a type is a reference.

Samana/CppSharp,txdv/CppSharp,u255436/CppSharp,SonyaSa/CppSharp,inordertotest/CppSharp,u255436/CppSharp,genuinelucifer/CppSharp,imazen/CppSharp,nalkaro/CppSharp,mohtamohit/CppSharp,SonyaSa/CppSharp,nalkaro/CppSharp,ddobrev/CppSharp,SonyaSa/CppSharp,genuinelucifer/CppSharp,ktopouzi/CppSharp,genuinelucifer/CppSharp,ktopouzi/CppSharp,KonajuGames/CppSharp,mono/CppSharp,SonyaSa/CppSharp,zillemarco/CppSharp,inordertotest/CppSharp,KonajuGames/CppSharp,inordertotest/CppSharp,mydogisbox/CppSharp,txdv/CppSharp,ktopouzi/CppSharp,mydogisbox/CppSharp,Samana/CppSharp,xistoso/CppSharp,u255436/CppSharp,mohtamohit/CppSharp,mohtamohit/CppSharp,mono/CppSharp,txdv/CppSharp,xistoso/CppSharp,imazen/CppSharp,zillemarco/CppSharp,mohtamohit/CppSharp,xistoso/CppSharp,mydogisbox/CppSharp,mohtamohit/CppSharp,Samana/CppSharp,ddobrev/CppSharp,KonajuGames/CppSharp,imazen/CppSharp,zillemarco/CppSharp,Samana/CppSharp,Samana/CppSharp,xistoso/CppSharp,nalkaro/CppSharp,txdv/CppSharp,inordertotest/CppSharp,mono/CppSharp,ktopouzi/CppSharp,ddobrev/CppSharp,mydogisbox/CppSharp,mydogisbox/CppSharp,zillemarco/CppSharp,nalkaro/CppSharp,nalkaro/CppSharp,imazen/CppSharp,mono/CppSharp,txdv/CppSharp,xistoso/CppSharp,KonajuGames/CppSharp,ddobrev/CppSharp,mono/CppSharp,SonyaSa/CppSharp,ddobrev/CppSharp,genuinelucifer/CppSharp,zillemarco/CppSharp,mono/CppSharp,imazen/CppSharp,u255436/CppSharp,ktopouzi/CppSharp,u255436/CppSharp,KonajuGames/CppSharp,inordertotest/CppSharp,genuinelucifer/CppSharp