tmr_read() for picoLisp.
Add tmr_start() function for PicoC.

* I may have missed out on this one
  when importing things from remix.
Build iv text editor (by default) for XMC4500.
Build pio support for XMC4500.
Fix typo in comment.
A few comments in the copyright section.
Cleanup MULTIPLEXER.c file.
tmr_gettimediff() for picoLisp.
tmr_getdiffnow() for picoLisp.
tmr_getmindelay() and tmr_getmaxdelay()	for picoLisp.
tmr_getclock() and tmr_setclock() for picoLisp.
Conditionally add tmr_decode() for picoLisp.

Condition: VTMR_NUM_TIMERS > 0
Add TODO for tmr_set_match_int() for picoLisp.
Add entries for picoLisp's timer module.
Add entries for picoLisp's timer module.