Add initial version of VFPSupport module
Detail: Initial VFP/NEON support code for RISC OS. Features: * Basic detection code for determining VFP version. Should work OK on all architecture versions. * Provides code to perform VFP/NEON context switches * Context switches can be lazy or immediate * Context register dumps can be stored in user-allocated memory or memory allocated by VFPSupport * Basic APIs for examining contexts and reporting available hardware features * "FastAPI" that privileged code can use for context switching in order to avoid SWI call overheads Missing/unfinished features: * No VFP exception handler is present, so the module will refuse to run on anything but a VFPv3 system * Lazy context switching is simplistic, opting to activate the new context upon the first undefined instruction abort instead of checking to see if it was a VFP instruction that triggered the abort * No interface to allow debuggers to easily get their hands on a register dump following a crash...
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