SUB2r Firmware using Clang/LLVM.

A lot of dependency on the ARM GCC compiler, its issues and required updates have lead us to take a change of integrating our code under a newer and modern compiler. The choice of which has become the LLVM/CLANG compiler. Usage of the most reliable and feature rich IDE the MS Visual Studio we had integrated our SUB2r Firmware into the MSVC build system before, which itself included both the ARM GCC and the LLVM/CLANG compilers but the frequently updated one is the LLVM/CLANG with rich benefits of static analysis, small code size and many others from the LLVM/CLANG.