Adding platform definitions using the compiler

Some LPCOpen code requires definitions to be added to the compilers argument list. Examples of these include definitions such as CORE_M0, CORE_M3, or __FPU_ENABLE. These definitions control how the code is built. Incorrect setup of these definitions may prevent the built code from working correctly on a platform.

Adding definitions to Keil UVision4 toolchains
Adding definitions to IAR EWARM toolchains
Adding definitions to LPC Xpresso-IDE toolchains