0.5.3

- Fix typos
- Translate more strings (Fixes #8)
- Fix translated strings (Fixes #5)
- Remove deprecated project files
- build: Fix compiler warnings
- Fix translated string (Fixes #4)
- Revert "Remove deprecated project files"
- Update copyright year
- Remove deprecated project files
- Update Makefile.am
- Fix strings if song data is not available (#9)
- build: Add GLib requirement
- build: Fix autotools warnings
- Use "logo-icon-name" instead of "logo" in about dialog
- build: Fix intltool lock file problem during make distcheck
- stream can be toggled from right-click menu
- hide contextual menu 'stream' entry if streaming_appl isnt
configured/set
- add a new 'stream' checkbox to contextual menu
- add mpc_stream_toggled callback
- add mpc_stop_streaming method
- use g_spawn_async instead of xfce_spawn_on_screen_with_child_watch to
spawn the streaming appl
- make sure error isnt NULL before dereferencing it
- launch the streaming client when clicking on play
- add mpc_launch_streaming() method
- Allow to configure a 'streaming command'
- use xfce_spawn_command_line() instead of deprecated
xfce_spawn_command_line_on_screen()
- Bump copyright year
- Fix compilation warnings
- autoconf: Some updates
- Update `.gitignore`
- Add basic GitLab pipeline
- Update URLs from goodies.x.o to docs.x.o
- Translation Updates:
  Albanian, Arabic, Armenian (Armenia), Basque, Belarusian, Bulgarian,
  Catalan, Chinese (China), Chinese (Taiwan), Croatian, Czech, Danish,
  Dutch, Eastern Armenian, English (Australia), English (Canada),
  English (United Kingdom), Estonian, French, Galician, German, Greek,
  Hebrew, Hungarian, Icelandic, Indonesian, Interlingue, Italian,
  Japanese, Korean, Latvian, Lithuanian, Malay, Norwegian Bokmål,
  Occitan (post 1500), Polish, Portuguese, Portuguese (Brazil),
  Russian, Serbian, Slovak, Slovenian, Spanish, Swedish, Thai, Turkish,
  Ukrainian, Urdu, Urdu (Pakistan), Uyghur