mousepad: upgrade 0.5.1 -> 0.5.2

Release notes for 0.5.2
=======================
- New Features:
  - Add a "Viewer Mode" toggle (#50, !72)
  - Improve `--quit` option: close all windows interactively (!71)
  - Improve encoding management (#42, !69)
    - Display the current encoding in the status bar
    - Make the default encoding configurable via GSettings
    - Allow to choose encoding in the "Open" and "Save As" dialogs (#42)
    - Add a command line option to choose encoding
  - Add a "Delete Line" action (#13, !66)
  - Make automatic addition of the last EOL character configurable (#53,!65)
  - Switch to GFile for I/O operations (#4, #27, #75, !64)
    - Add file monitoring (#75)
    - Add a setting to create a tilde-backup file when saving (#27)
    - Make saving atomic (#4)

- Appearance Changes:
  - Filter files on mime type in the "Open" and "Save As" dialogs (#2, #35, !67)

- Code Refactoring:
  - Improve encoding management (#42, !69)
    - Make encoding dialog more generic and self-contained
    - Encodings definition review
    - Clarify encoding management when opening files
    - Improve unicode BOM management
  - Switch to GFile for I/O operations (#4, #27, #75, !64)
    - Set the save action sensitivity more precisely
    - Let GFile APIs check for file existence when reading
    - Let GFile APIs check for external modifications when saving
    - Basic switch to GFile for I/O operations

- Bug Fixes:
  - Make "replace" and "replace all" behaviors consistent (#94)
  - Ensure that the page setup is properly applied when printing (#90)
  - Avoid character escape issues in menu item action names (#91)
  - Properly initialize document search properties
  - Avoid illegal memory access when searching with tab changes (!73)
  - Revert to "Wrap Around" always true for the search bar (#83)
  - Prevent too late accesses to the buffer in selection mode
  - Direct call to keybinding signals for "Delete" and "Select All" (#83)
  - Improve editing keybindings consistency (#83)

- Translation Updates

Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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