Expose certain APIs to Lua

[adam4813]

Fixes #184

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 19 lines in your changes missing coverage. Please review.

Project coverage is 10.86%. Comparing base (1b0690f) to head (314cce4).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
common/lua-system.cpp	0.00%	16 Missing ⚠️
server/client-connection.cpp	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
- Coverage   10.88%   10.86%   -0.02%     
==========================================
  Files         110      110              
  Lines       13335    13354      +19     
==========================================
  Hits         1451     1451              
- Misses      11884    11903      +19     

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