Add frozen land texture

This change from r0cd63b963330 caused more troubles than solved. Also fix some warnings.

due to popular demand, add a compile time switch to manually select whether to build the internal physfs (default) or not

Add land freezing

Global notice with /global command. Can now warn users when doing server restart.

documentation

Oh, and # too to prevent occasional game hang when N is followed by #

perform a version check before including physfs (maybe there is a better place for this?) and allow overriding automagic search

Flush buffer on N command

disable unneeded physfs archives (as of bug #529)

Try to prevent hedgehogs number in team desync

this should hijack the linker name and always pick the bundled physfs when another version is already prsent

Merge

blindly updated Android build files for new physfs

Merge

updated ios project files for the new phys build system

Merge

Workaround queued signals problem in netclient instead. Should fix everything.

this should make physfs happy to link on windows too, forcing every function in its proper dll and skipping linklib

Updating Italian translation. In progress, as usual.

Unbreak build

workaround static physfs static linking on linux

We need this to fix hedgehog numbers desync (workarounded in previous revision)

and now compile and link properly

Fix stupid mistake which made checker desync almost always

update cmake files to use the two libraries independently

Found another possible source of desync, trying similar workaround on this

split extras and src

Forbit guest checkers

use standard library prefix