[XF Addon] Thread Tagging Improvements 1.0.8 Patch Level 1

Fixes for the JS that handles auto-tagging while creating a new thread:

• Don't rely on jQuery which has been removed in XF2.3
• Add tags with Tagify which has replaced select2

Note: Can only be installed on XF2.3, not compatible with 2.2

New version with 2 fixes:

• Cronjob compatibility with XF2.3 changes
• Removed unused option and code that triggered page error when using "Tag contains" filter.