WIP: feature: add plugin system for template functions

[brainexe]

[codecov-commenter]

Codecov Report

Merging #204 (10a630a) into master (7e44ba2) will decrease coverage by 0.42%. The diff coverage is 18.42%.

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@@            Coverage Diff             @@
##           master     #204      +/-   ##
==========================================
- Coverage   82.20%   81.79%   -0.42%     
==========================================
  Files         128      129       +1     
  Lines        5828     5866      +38     
==========================================
+ Hits         4791     4798       +7     
- Misses        915      945      +30     
- Partials      122      123       +1     

Files Changed	Coverage Δ
bot/plugin.go	11.42% <11.42%> (ø)
bot/bot_init.go	63.21% <100.00%> (+1.31%)	:arrow_up:

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