Added new maintainer to `setup.py`.
Added !PyCharm project file to git ignore.
Source code formatting via !PyCharm.
Removed copy of jQuery 1.1. This was no longer used by the plugin, as jQuery is provided by the Trac core. This file is likely just a holdover from the early development of the project.
 * Removed comments about !ClearSilver.
 * Only import `resource_filename` where it is needed.
  * Whitespace changes.
Organized package files.
 * Cleaned up and removed unused imports.
 * Minor refactoring for coding style.
 Refs #10194: Fixed Traceback when moving a ticket number between the blocking and blocked by field and also adding a comment.