Modernize django filer

[jrief]

Description

superseeds #1341

• Remove broken PR #1255
• Replace re_path against path
• Use admin.decorators.action to mark actions
• Remove dysfunctional jQuery function $.actions()

Checklist

• [x] I have opened this pull request against master
• [ ] I have added or modified the tests when changing logic
• [x] I have followed the conventional commits guidelines to add meaningful information into the changelog
• [x] I have read the contribution guidelines and I have joined #workgroup-pr-review on Slack to find a “pr review buddy” who is going to review my pull request.

[codecov[bot]]

Codecov Report

Merging #1344 (120e604) into master (0bbbe88) will decrease coverage by 0.39%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1344      +/-   ##
==========================================
- Coverage   72.40%   72.02%   -0.39%     
==========================================
  Files          72       72              
  Lines        3269     3235      -34     
  Branches      532      537       +5     
==========================================
- Hits         2367     2330      -37     
- Misses        735      739       +4     
+ Partials      167      166       -1     

Impacted Files	Coverage Δ
filer/admin/tools.py	76.81% <ø> (-2.68%)	:arrow_down:
filer/settings.py	79.06% <ø> (+0.34%)	:arrow_up:
filer/admin/folderadmin.py	71.72% <100.00%> (-0.15%)	:arrow_down:
filer/templatetags/filer_admin_tags.py	86.95% <100.00%> (-1.66%)	:arrow_down:

... and 2 files with indirect coverage changes

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This will now be closed due to inactivity, but feel free to reopen it.