FlashForth V 4.5 for dsPIC

FlashForth v4.5
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- Optimised NEXT
- Added tail call optimisation and tail looping.
- >BODY made visible
- UART RX now ignores XON/XOFF, earlier these went into the RX FIFO.
- TO defined in core.fth
- IDUMP. Dumps also the high byte of each instruction word.