Optimisation to use block operations on regfile, addrmap and arrays

[krcb197]

• Move to a scheme where only the top level address map is supplied with callbacks, this allows a owning block to redirect the call-backs for a child to optimise operations
• Split the sync and non-async Address Map and RegFile
• Implemented the support for optimised read/write using block operations on register arrays
• Documentation improvements:
  • Explain a RAL versus HAL - Including a new example
  • Settled on Register Access Layer for RAL
  • Added a new placeholder section to explain the design
• Added license statements to all files