Escape sequences only work on entire cells

[Ken-g6]

If I write a cell like this:

|!-Some text-! and some more text|

Parsing problems can occur.

[Ken-g6]

Fixing this appears to require rewriting the entire Mastiffe line parsing system. Instead of parsing individual cells, an entire line will have to be parsed for escape sequences first.

[Ken-g6]

I added an error message to warn users about this problem. An earlier edit improved this problem, but it's still not fixed.