Added helper property to represent if a property is an indexer.
Added helper property to represent if a property is an indexer.

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