Also fix a potential seed truncation issue on platforms where the
range of ptrdiff_t (the underlying type of lua_Integer) is too small.

abort() doesn't benefit from the high level abstractions from FATAL_ERROR.

Remove outdated loglevel list from a l_util.cpp comment,
and rather point to the updated code.

Fixes #3280

- Disabled by default (except players)
- Fixes #2984

Previously, the invocation of Logger::addOutput(ILogOutput *out) led to
an out of bounds write of the m_outputs vector, resulting in the
m_silenced_levels array being modified.

Fortunately, the only caller of that method was android system logging,
and only since a few commits ago.

Complete set of parameters for each of mandelbrot and julia sets
The julia set structure often needs different iterations and scale

Fixes #3291

Thanks to @arpruss for reporting the bug, and suggesting the fix.

Also, remove trailing whitespaces.

Previously, xgettext failed to resolve the dynamic call.
Thanks to @JakubVanek for pointing this out.

-> Get rid of Logger::logToSystem and use normal downstream output system for android instead

-> Give the downstream output system more information: enrich the log function of ILogOutput
	with information and add ICombinedLogOutput for easier use.

-> Make Logger::getLevelLabel() static and public so that it can be used by downstream log output.

-> Add g_ and m_ prefixes where required

* Add key settings to setting table and ignore them later
  This way they are added to the auto-generated minetest.conf.example
* Add flags type
* Add input validation for int, float and flags
* Break in-game graphic settings into multiple sections
* Parse settingtpes.txt in mods and games
* Improve description for a lot of settings
* Fix typos and wording in settingtypes.txt
* Convert language setting to an enum

Thanks to SmallJoker for pointing this out.

fixes https://github.com/minetest/minetest_game/issues/537

Index more columns in the action table of the rollback DB to improve the performance of /rollback_check

Flushes the buffer of rollback actions that wait to get saved in two more situations:

1. Flushes in the destructor of the rollback. This makes the server not
forget the last < 500 rollback entries when it shuts down.

2. Flushes the rollback when /rollback_check is invoked. This is neccessary
as otherwise it leads to confusion if users want to test the rollback functionality
by placing a node and then executing the check on it, or if the actions were
very recent out of other reasons.

- Fix thread name reset on start()
- Fully reset thread state on kill()
- Add unittests to check for correct object states under various circumstances

Add findLiquidSurface() function to mapgen.cpp
Update lua_api.txt

The callback can now be invoked with either the player object or name as
the first parameter, and with either a table or a list of strings, like
this:

    minetest.check_player_privs(player_name, { shout = true, fly = true })
    minetest.check_player_privs(player_name, "shout", "fly")
    minetest.check_player_privs(player, { shout = true, fly = true })
    minetest.check_player_privs(player, "shout", "fly")

Currently translated at 72.6% (202 of 278 strings)

Currently translated at 100.0% (278 of 278 strings)

Currently translated at 100.0% (278 of 278 strings)

Fixes #3262.

Default is true for backwards compatibility
Update lua_api.txt

Everywhere where wstrgettext was used, its output was converted back
to utf8. As wstrgettext internally converts the return value
from utf8 to wstring, it has been a waste. Remove the function, and
use strgettext instead.

According to its man page, the function gettext(3)
"may return a nonempty string" when msgid is "".

This commit fixes a bug where the comment ""
for some settings caused gettext to return a
"nonempty string", in this case header info of the
po file.

- setOpenedTrees(): this internal function was calling setSelected()
  to update m_selected. Since setSelected() calls autoScroll(),
  this caused the scrollbar to scroll back to the selected row
  in some cases when that shouldn't be done.

  For example, clicking the "+" to open a tree caused autoscroll.

  Fix this by making setOpenedTrees() modify m_selected directly.

- setDynamicData(): set scrollbar position after calling
  setSelected(), not before. This avoids setSelected()'s autoscroll
  messing up the scrollbar position again.

- setSelected(): If an invisible row is selected, open all parents
  of the selected row in order to make the selected row visible.

  This fixes the issue where all the trees are closed again whenever
  you return from the setting edit dialog to the settings tab.