unblocks required syscalls gettimeofday and clock_gettime

See merge request !69

improve sandbox stability

See merge request pwmt/zathura!64

zathura version 0.5.2

Proper text selection upon mouse drag (Closes #26).

Closes #26

See merge request !59

Keep  order when using the fish suffix completion

See merge request !63

improve ui feedback

See merge request !62

Update seccomp filter

See merge request !61

Changes:
	- Fix Sqlite typo;
	- Add missing 'pkgconf' build dependency;

Signed-off-by: Carlos Torres <torr@disroot.org>

Add epoll_create1 syscall for copy

See merge request !58

Version 0.5.1

Version 0.5.0

Fix use of uninitialized value

See merge request pwmt/zathura!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)
```