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Version 0.5.1

Version 0.5.0

Fix use of uninitialized value

See merge request !57

Contents of string `content` are unitialized before copying of `dummy_content`.
Using `g_strlcat` appends `dummy_content` to the uninitialized junk, and
by changing that to `strcpy` the uninitialized values aren't used.

Relevant Valgrind error when running zathura with no arguments:
```
==15845== Conditional jump or move depends on uninitialised value(s)
==15845==    at 0x566EB2D: UnknownInlinedFun (gstrfuncs.c:1534)
==15845==    by 0x566EB2D: g_strlcat (gstrfuncs.c:1521)
==15845==    by 0x12B16D: zathura_db_read_key_file_from_file (database-plain.c:171)
==15845==    by 0x12D39D: UnknownInlinedFun (database-plain.c:295)
==15845==    by 0x12D39D: plain_set_property (database-plain.c:371)
==15845==    by 0x55C17AD: object_set_property (gobject.c:1607)
==15845==    by 0x55C1C1C: g_object_new_internal (gobject.c:2047)
==15845==    by 0x55C3307: g_object_new_valist (gobject.c:2355)
==15845==    by 0x55C383D: g_object_new (gobject.c:1824)
==15845==    by 0x117944: UnknownInlinedFun (database-plain.c:226)
==15845==    by 0x117944: init_database (zathura.c:373)
==15845==    by 0x11B8EA: zathura_init (zathura.c:473)
==15845==    by 0x114B99: UnknownInlinedFun (main.c:111)
==15845==    by 0x114B99: main (main.c:282)
```

Fix zathura not rendering on hidpi displays

See merge request !55

Related to https://gitlab.gnome.org/GNOME/gtk/-/issues/3115.
Ideally, GNOME could fix their library to return 0 instead of 1.

Avoid to name variables after a C++ keyword.

Send the dbus response first, and then start parsing and rendering of
the synctex forward search.

This reverts commit 2af36e27.

Minor improvements

See merge request !54

types.h is for types accessible to plugins.

If rendering of the rectangle takes too long, the connection on the
message bus times out.

improve seccomp filter

See merge request !53

Clean process shutdown by sandbox

See merge request !52

Add rseq syscall to strict sandbox mode

See merge request !51