Enable revo C++ support:
1. Set USE_CXX to enable compliation and linkage of C++ source code
2. Disables rtti and exceptions
3. operator new and delete call pios malloc/free
4. Static constructor invocation supported
5. Additional methods, compile options, and need to have main as a cpp to solve various link issues when using static constructors but to avoid adding unnecessary libs.
6. Upgrade arm tools
