CocoMUD client

Command stacking would be allowed by a single character defined in settings. The most common case is the semicolon, although that could be changed. When the command is checked before sending, if command stacking is active, the entered command should be split using regular expressions.

Using lookahead and lookbehind seems to be the solution. Here is a short code excerpt that seems to do the trick.

>>> stacking = ";" 
>>> stacking = re.escape(stacking)
>>> splitter = re.compile("(?<!{s}){s}(?!{s})".format(s=stacking))
>>> splitter.split("a first command;another one;and a third with a semi;;colon;and a fourth")
['a first command', 'another one', 'and a third with a semi;;colon', 'and a fourth']
>>>

Added in commit ab6caef9038b376ee40cf75f8835cff817b0d98c.
Note that the test to encode the message has been moved into the client instead of the window. It shouldn't have consequences, but it may be worth noting.