Switch to a new i18n library

[csmith]

This fixes issues with translations with quotes etc that need to be
escaped, and deals with multi-line strings.

Closes #227

[codecov]

Codecov Report

Merging #275 into master will decrease coverage by 0.07%.
The diff coverage is 7.69%.

@@             Coverage Diff             @@
##             master    #275      +/-   ##
===========================================
- Coverage     30.87%   30.8%   -0.08%     
  Complexity       48      48              
===========================================
  Files            22      22              
  Lines          1234    1237       +3     
  Branches        228     229       +1     
===========================================
  Hits            381     381              
- Misses          816     819       +3     
  Partials         37      37

Impacted Files	Coverage Δ	Complexity Δ
src/main/kotlin/com/dmdirc/ServerlistDialog.kt	36.54% <ø> (ø)	0 <0> (ø)	⬇️
src/main/kotlin/com/dmdirc/IrcEventMapper.kt	66.66% <ø> (ø)	36 <0> (ø)	⬇️
src/main/kotlin/com/dmdirc/MainView.kt	0% <ø> (ø)	0 <0> (ø)	⬇️
src/main/kotlin/com/dmdirc/SettingsDialog.kt	23.72% <ø> (ø)	0 <0> (ø)	⬇️
src/main/kotlin/com/dmdirc/WindowUI.kt	22.38% <0%> (ø)	0 <0> (ø)	⬇️
src/main/kotlin/com/dmdirc/Translations.kt	8.33% <0%> (-2.78%)	0 <0> (ø)
src/main/kotlin/com/dmdirc/JoinDialog.kt	30.43% <0%> (ø)	0 <0> (ø)	⬇️
src/main/kotlin/com/dmdirc/Config.kt	82.45% <100%> (ø)	0 <0> (ø)	⬇️