Make warning in skill menu stand out more

When attempting to leave skill menu while not having any skill selected.
[txc] autofix replaces ascii quotes by unicode.

Handle english, german and french. Other languages default to english quotes
but it's easy to fix.

It won't touch text containing any lua otherwise it messes the strings.
It could fix text outside lua, but it currently doesn't.
[txc] Allow breaking lines between 2 tags.

This helps readability quite a lot. Although it means that putting a whitespace
between 2 tags should be avoided when possible, because it might be removed
on unwrap (both by txc and crawl), if the line break happens to be on this
specific whitespace. Quite unlikely, but if it does happen, it can be fixed by
using a non-breaking space (0xA0).

Note that it works by inserting a line feed (\f) between tags which is later
removed. This makes lines containing consecutive tags to have a slightly
shorter maximal length.
Rewrap descriptions.

And a couple of minor fixes.
[txc] Don't try to remove whitespaces around punctuation in ja and zh.

Probably I introduced some of them, but I'm afraid an automated fix might
do more harm than it fixes. The script shouldn't mess with whitespaces anymore.
[Transifex] Sync.

Signed-off-by: Raphael Langella <raphael.langella@gmail.com>
Merge Lightli and Grunt's E3M8 maps.

I'd say Lightli's was a good deal better, but Grunt's doesn't have issues
with placement (not the vault's fault, it's because of Dis layout), has
non-decorative purposes, and is allowed to have loot.

It's disputable what "better" means, as we can't represent the walkway.
[txc] Polish quotation marks.

I guess »« shouldn't be used by default, they're very rare and used
practically only when nested inside „”.

If you want a good degree of completeness, there's:
https://en.wikipedia.org/wiki/International_variation_in_quotation_marks
[txc] Don't break danish quotes when autofixing french ones.
Replace ascii by localized unicode for dash and quotation marks.

Done all languages from ability to monsters and quotes in english.
Banish serial_teleporters.

As written, it's terribly gimmicky, very spoilery, and generally
considered annoying.

There are probably good uses for this concept (see e.g.
wizlab_golubria), but these aren't it; I'd probably welcome a better
set of vaults that make use of them properly.
Remove another badly designed teleporter vault.

I've never been very happy with this; I'm still not happy with the way
there'll still be some code for it left over just to guarantee that it
doesn't screw up level connectivity.
Start using -Wredundant-decls; fix all the instances I get

That is, unless you count the ones in ncurses' headers, which I can't
do anything except suppress.
[txc] Several improvements to auto_fix and wrapping.
More formatting fixes and unicode replacement in descriptions.
And again more formatting and unicode fixes.

That's all for now.
Unbreak games with serial_teleporters.
Fix detecting missing options in WebTiles
Support tile_map_pixels in WebTiles
Allow settings tile_map_pixels to 0

It was already the default value. Also document what that does.