sbbs_t::bputs() now checks online value in while() loop.

sbbs_t::rputs() now:
* Can accept an optional length argument which allows it to output strings
with embedded NULs if desired.
* If a call to outcom() fails, terminates and returns the sent number of chars.
* Performs Telnet IAC escaping when appropriate.
* Checks online value in while() loop.
* No longer output to log if "on local" - event scripts aren't expected to use
this function.
JS console.write() and writeln() now use rputs() instead of putcom() so that
Telnet IAC chars are escaped when necessary and saveline/restoreline will work.
sbbs_t::putcom() now returns the number of chars sent successfully.