Add ability to apply plugin to a library module

[mateuszkwiecinski]

Should fix #77

[codecov]

Codecov Report

Merging #86 into master will increase coverage by 0.30%.
The diff coverage is 76.92%.

@@             Coverage Diff              @@
##             master      #86      +/-   ##
============================================
+ Coverage     58.65%   58.96%   +0.30%     
  Complexity       80       80              
============================================
  Files            12       13       +1     
  Lines           416      424       +8     
  Branches         74       76       +2     
============================================
+ Hits            244      250       +6     
  Misses          121      121              
- Partials         51       53       +2     

Impacted Files	Coverage Δ	Complexity Δ
...ct/starter/easylauncher/plugin/EasyLauncherTask.kt	39.21% <50.00%> (ø)	14.00 <0.00> (ø)
...om/project/starter/easylauncher/plugin/AgpUtils.kt	75.00% <75.00%> (ø)	0.00 <0.00> (?)
.../starter/easylauncher/plugin/EasyLauncherPlugin.kt	82.92% <100.00%> (ø)	6.00 <0.00> (ø)

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