https://gitlab.synchro.net/main/sbbs/-/commit/e3f17e6411aba06d9894b169
Modified Files:
	src/sbbs3/writemsg.cpp
Log Message:
Internal message/line editor improvements

* Allow left and right arrow keys to move between lines (within reason)
* Use the K_USEOFFSET getstr() mode flag to keep cursor position when moving
  between lines with arrow keys
* Be smart about integer padding when /Listing lines with numbers
* Add range checking (!) and better error reporting for /Lx argument value
--- SBBSecho 3.21-Linux