Add more meaningful error messages around font loading

[mateuszkwiecinski]

#201

[codecov]

Codecov Report

Merging #211 (dc4b7ba) into master (e919805) will increase coverage by 1.00%.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##             master     #211      +/-   ##
============================================
+ Coverage     63.02%   64.02%   +1.00%     
- Complexity       87       93       +6     
============================================
  Files            14       14              
  Lines           549      556       +7     
  Branches         97       99       +2     
============================================
+ Hits            346      356      +10     
  Misses          140      140              
+ Partials         63       60       -3     

Impacted Files	Coverage Δ
.../project/starter/easylauncher/filter/FontLoader.kt	66.66% <66.66%> (ø)
.../starter/easylauncher/plugin/EasyLauncherPlugin.kt	84.50% <66.66%> (-0.43%)	⬇️
...ct/starter/easylauncher/filter/ChromeLikeFilter.kt	21.42% <100.00%> (+0.37%)	⬆️
...t/starter/easylauncher/filter/ColorRibbonFilter.kt	65.78% <100.00%> (+0.85%)	⬆️
.../starter/easylauncher/plugin/EasyLauncherConfig.kt	78.75% <0.00%> (+3.75%)	⬆️

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