Added some string helper methods.
Added some string helper methods.

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