Current glib minimum is 2.50.0

Fixes #440

710 translated messages, 75 untranslated messages.

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678 translated messages, 107 untranslated messages.

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g_drive_is_removable seems to be more reliable for
detecting removable USB HDD partitions

Fixes #384

Co-authored-by: Theo Linkspfeifer <lastonestanding@tutanota.com>

As agreed  in the 4.16 roadmap

2.50 is required for a fix of Issue #384

Targets app_info added via "open with"-->"other application"--> "custom
command"

Introduces a comparison check to dont add the same app_info multiple
times.

Fixes #309

for open with --> custom command dialog.
When the file-chooser dialog was used to pick a file, whitespace
characters will be escaped.

This will fix this old bug:
https://bugzilla.xfce.org/show_bug.cgi?id=10883
withouth causing trouble for direct command input (Issue #425)

Fixes #425

This will re-introduce this old bug:
https://bugzilla.xfce.org/show_bug.cgi?id=10883

748 translated messages, 37 untranslated messages.

Transifex (https://www.transifex.com/xfce/public/).

747 translated messages, 38 untranslated messages.

Transifex (https://www.transifex.com/xfce/public/).

786 translated messages.

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... instead of failing to load all UCA's.

This will simplify switching between thunar versions with different UCA
elements. (E.g. When a new element will be introduced, like foreseen in
Issue #184)

Since "current-directory" of the launcher was not initialized, the
context menu was not fully shown, and activation led to a crash.

Fixes #436

With the previous fix, mount and unmount were visible at the same time
for USB devices.

Fixes #437

Prevent crash if there is actually nothing to poke

Was outdated. Nowadays https://gitlab.xfce.org is used to track issues

g_steal_pointer() is available since GLib 2.44

Signed-off-by: Jan Ziak <0xe2.0x9a.0x9b@gmail.com>

Fixes #430

742 translated messages, 44 untranslated messages.

Transifex (https://www.transifex.com/xfce/public/).

786 translated messages.

Transifex (https://www.transifex.com/xfce/public/).

786 translated messages.

Transifex (https://www.transifex.com/xfce/public/).

786 translated messages.

Transifex (https://www.transifex.com/xfce/public/).

786 translated messages.

Transifex (https://www.transifex.com/xfce/public/).

785 translated messages, 1 untranslated message.

Transifex (https://www.transifex.com/xfce/public/).

786 translated messages.

Transifex (https://www.transifex.com/xfce/public/).

Fixes #423

786 translated messages.

Transifex (https://www.transifex.com/xfce/public/).

As well improves the situation for #156

780 translated messages, 6 untranslated messages.

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786 translated messages.

Transifex (https://www.transifex.com/xfce/public/).