Allow passing any _drawable_ resource, not just adaptive icon xmls

[mateuszkwiecinski]

Fixes #441

[codecov]

Codecov Report

Merging #460 (d6a0025) into master (577091f) will decrease coverage by 0.20%.
The diff coverage is 58.33%.

@@             Coverage Diff              @@
##             master     #460      +/-   ##
============================================
- Coverage     81.02%   80.82%   -0.20%     
  Complexity      114      114              
============================================
  Files            17       16       -1     
  Lines           627      631       +4     
  Branches         99      100       +1     
============================================
+ Hits            508      510       +2     
- Misses           47       49       +2     
  Partials         72       72              

Impacted Files	Coverage Δ
...ct/starter/easylauncher/plugin/EasyLauncherTask.kt	76.92% <37.50%> (-6.42%)	⬇️
...ect/starter/easylauncher/plugin/IconTransformer.kt	90.38% <100.00%> (ø)
...m/project/starter/easylauncher/plugin/XmlReader.kt	72.00% <100.00%> (+4.00%)	⬆️
...ect/starter/easylauncher/plugin/models/IconFile.kt	100.00% <100.00%> (ø)