[plugin] Auto issue orders

[SchrodingersGat]

Adds a built-in plugin to automatically issue orders on their assigned target date

• Closes https://github.com/inventree/InvenTree/issues/8983

Additional Documentation Improvements

• Adds "image" macro to improve embedding of images in the documentation
• Adds documentation for each "builtin" plugin
• Adds check to ensure that all "settings" are documented

TODO

• [ ] Add unit testing
• [x] Update documentation (add info on all built-in plugins)

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 42.10526% with 33 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 86.31%. Comparing base (89f8f13) to head (5a6a604). :warning: Report is 337 commits behind head on master.

Files with missing lines	Patch %	Lines
...venTree/plugin/builtin/events/auto_issue_orders.py	37.73%	33 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9565      +/-   ##
==========================================
- Coverage   86.35%   86.31%   -0.04%     
==========================================
  Files        1230     1231       +1     
  Lines       53962    54013      +51     
  Branches     2255     2255              
==========================================
+ Hits        46597    46622      +25     
- Misses       6795     6821      +26     
  Partials      570      570              

Flag	Coverage Δ
backend	88.25% <42.10%> (-0.05%)	:arrow_down:

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