Fix invalid escape sequences

[meator]

Hello. I am a Void Linux package maintainer and I have noticed that terminator produces the following syntax warnings when issuing python3 -m compileall:

./usr/lib/python3.12/site-packages/terminatorlib/plugins/maven.py:35: SyntaxWarning: invalid escape sequence '\-'
  maven_filters['apache_maven_plugin_artifact_id'] = 'maven\-(%(apache_maven_plugin_shortname)s)\-plugin' % maven_filters
./usr/lib/python3.12/site-packages/terminatorlib/plugins/maven.py:36: SyntaxWarning: invalid escape sequence '\-'
  maven_filters['codehaus_maven_plugin_artifact_id'] = '(%(codehaus_maven_plugin_shortname)s)\-maven\-plugin' % maven_filters
./usr/lib/python3.12/site-packages/terminatorlib/plugins/maven.py:37: SyntaxWarning: invalid escape sequence '\.'
  maven_filters['maven_plugin_version'] = '[a-zA-Z0-9\.-]+'
./usr/lib/python3.12/site-packages/terminatorlib/plugins/mousefree_url_handler.py:54: SyntaxWarning: invalid escape sequence '\:'
  searchtext  = "https?\:\/\/[^\s]+[\/\w]"
./usr/lib/python3.12/site-packages/terminatorlib/plugins/url_handlers.py:16: SyntaxWarning: invalid escape sequence '\s'
  match = '\\b(lp|LP):?\s?#?[0-9]+(,\s*#?[0-9]+)*\\b'
./usr/lib/python3.12/site-packages/terminatorlib/plugins/url_handlers.py:39: SyntaxWarning: invalid escape sequence '\+'
  match = '\\b((lp|LP):%(project)s(/%(series)s)?|(lp|LP):%(group)s/(%(project)s|\+junk)/%(branch)s)\\b' % lpfilters

This pull request fixes them.

It looks like I'm not the only one who has noticed this problem:

resolves #920

@ScottMcCormack Does this pull request fix the issue for you? Your issue is related to version 2.1.3, so the warnings might be slightly different on master.

[mattrose]

Huh, I actually resolved a bunch of them in #886 but apparently I didn't catch them all. I'll pull this down and merge it in, thanks!

[mattrose]

How did you get those warnings? I tried to reproduce this on master and I didn't get any SyntaxWarnings at all. did you just run python3 -m compileall in the terminator dir?

[mattrose]

Gonna merge this in, but still curious as to how you were able to generate those syntax warnings.

[meator]

I have discovered this issue because the XBPS package manager used by Void Linux has a trigger for byte compiling python packages.

There are likely better ways to reproduce this, but I used the following method to reproduce it manually:

cd terminator
python3 setup.py install --root="$PWD/dest"
cd dest
python3 -m compileall -f -q .

Older versions of Python do not print these warnings. I used Python 3.12.3.