[ADD] Optional settings for Discord Proxy (#240)

[ppfeufer]

Description

Added

• Optional settings for Discord Proxy. Comes in handy when used in a Docker environment.

Fixes #240

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 52.73%. Comparing base (55f3f07) to head (b0d6075).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
aasrp/discord/channel_message.py	33.34%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #241      +/-   ##
==========================================
+ Coverage   52.62%   52.73%   +0.11%     
==========================================
  Files          21       21              
  Lines        1241     1246       +5     
  Branches       95       95              
==========================================
+ Hits          653      657       +4     
- Misses        581      582       +1     
  Partials        7        7              

Files with missing lines	Coverage Δ
aasrp/app_settings.py	66.67% <100.00%> (+12.13%)	⬆️
aasrp/discord/channel_message.py	27.50% <33.34%> (-0.70%)	⬇️

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