xfce4-mousepad: update to 0.5.0

Change log:

0.5.0
======
- Bump required GTK+ in `mousepad-prefs-dialog.ui` (#78)
- Fix an oversight in updating actions state (#76)
- Remove TODO file (#74)
- Ensure that opening modes are excluded from translation
- Translation Updates:
  Albanian, Bulgarian, Chinese (China), Dutch, French, German, Greek,
  Hebrew, Indonesian, Italian, Norwegian Bokm奪l, Portuguese,
  Portuguese (Brazil), Slovenian, Spanish, Japanese

0.4.90
======
Release candidate for upcoming stable version 0.5.

- Dependency Changes:
  - GLib >= 2.45.8
  - GTK+ >= 3.20
  - GtkSourceView >= 3.24
  - GTK+ 2 support has been removed
  - GtkSourceView 2 support has been removed

- New Features:
  - Add keybindings to show the menubar temporarily when hidden
  - Add command line option and setting for file opening mode
  - Improve encoding dialog
  - Add regex search

- Discontinued Features
  - multi-select (GTK+ 2)

- Appearance Changes
  - Replace `$HOME` with a tilde in displayed filename
  - Add new default keybindings and reveal some hidden ones
  - Search bar tweaks
  - Make tabs expanded for consistency with other Xfce programs
  - Add copyright and license info to About dialog
  - Improve label texts of "Find and Replace" dialog and search bar
  - Make the statusbar smaller
  - Add new app icon and switch to reverse DNS name
  - Save the state of the "highlight all" button in the search bar
  - Update window title of Find and Replace dialog
  - Add "Wrap around" check box to Find and Replace dialog (Bug #11290)
  - Infer filetype from shebang line (Bug #10514)
  - Show info when Templates directory does not exist (Bug #10486)

- Code Refactoring
  - Restore the use of the file `accels.scm`
  - Code refactoring around saving and restoring window geometry
  - Improve save-related actions
  - Fully switch to GtkApplication
  - Avoid deprecation warnings 5: CSS related
  - Avoid deprecation warnings 4: GtkUIManager and GtkAction
  - GtkStock
  - Avoid deprecation warnings 2: miscellaneous
  - Avoid deprecation warnings 1: alignment and padding
  - Avoid compilation warnings other than deprecation
  - Remove support for GTK+2
  - Switch to README.md and foreign automake mode
  - Add basic GitLab pipeline

- Bug Fixes:
  - Remove README.md from DISTCLEANFILES, it's not generated
  - Fix crash when dragging tab to GSV widget
  - Change GtkTextView wrap mode to GTK_WRAP_WORD_CHAR
  - Initialize the recent manager if needed at startup
  - Prevent search bar from overlapping the document
  - Properly disconnect signal handlers
  - Fix make distcheck
  - Fix color modifications in search entries
  - Do not open an empty document when encoding failed
  - Do not search for previously selected text
  - Update search field with selected text
  - Bug #16717: Move from exo-csource to xdt-csource
  - Remember last save location (Bug #14165)
  - Use g_get_user_dir to get Templates directory (Bug #11048)
  - Sync remaining menu actions to their settings (Bug #11046)
  - Install appstream in metainfo folder (Bug #11200)
  - Add appdata file (Bug #11200)
  - Fix building with `--enable-dbus --disable-gtk3`
  - Change visibility of fullscreen bars after small delay (Bug #9735)
  - Fix return type of fullscreen settings (Bug #9735)

- Translation Updates:
  Albanian, Arabic, Armenian (Armenia), Basque, Belarusian, Bulgarian,
  Catalan, Chinese (China), Chinese (Taiwan), Croatian, Czech, Danish,
  Dutch, Eastern Armenian, English (Australia), English (United
  Kingdom), Estonian, Finnish, French, Galician, German, Greek, Hebrew,
  Hungarian, Icelandic, Indonesian, Interlingue, Italian, Japanese,
  Kazakh, Korean, Lithuanian, Malay, Norwegian Bokm奪l, Norwegian
  Nynorsk, Occitan (post 1500), Polish, Portuguese, Portuguese
  (Brazil), Romanian, Russian, Serbian, Slovak, Slovenian, Spanish,
  Swedish, Telugu, Thai, Turkish, Ukrainian, Uyghur


(gutteridge)