Performance benchmarking
  - benchmarking suite added based on VFX Forth example
  - initial benchmarks vs. VFX Forth indicate 1:200 performance ratio on 50:2600 clock speed difference
Improved performance vs. timing constraints
 - switched on synthesis/ register rebalancing
 - some logic improvements (e.g. ControlUnit/SRAM flag, HW_Registers/dataout)
System software additions
 - 2! and 2@