Unified chunk size (3) / reduced chunks' weight.
interaction menu: fixed a zero-pointer bug in FxIntRefreshContentsMenuTimer

When the array is not copied, it can under some circumstances be manipulated in DoMenuRefresh when it is called the next time from another location than the contents-update-effect. The effect does not want the array to change, though.
added missing SolidMask.png to Hideout/ShieldGem (fixes being able to pass through shield)
Do not exit round on closing game over dialoge with ✗-button
Added more chunks: Amethyst, Ice, Ruby, Snow
Merge branch 'master' into heavy-resources
Fix use after free and conditional jump on uninitialized
object interaction menu: increase size of side-bar items
Clonks can now exit things and do both interactions if an object can be grabbed and entered
Proper shutdown on SIGINT/SIGTERM/SIGHUP
Fixed Ametyst to Amethyst typos
Default-deactivate gcc precompiled headers in CMakeLists
Fix dedicated
AutoFrameSkip: Graphics option to reduce lag by slow

Skips drawing every second frame if drawing the previous frame was too slow
Setting is controlled by game host
Default: on

Imported from Clonk Rage

From e6e680f49ac50a352e9a051ee21622e7f00648b6 Mon Sep 17 00:00:00 2001
From: sven2 <sven2@786b8e90-9c09-0410-89a9-bccc6ef1e79b>
Date: Sat, 21 Sep 2013 21:34:44 +0000
Subject: [PATCH] + AutoFrameSkip: Graphics option to reduce lag by slow
 clients in network games

git-svn-id: https://www.clonk.de:83/svn/clonk/stable@14501 786b8e90-9c09-0410-89a9-bccc6ef1e79b
Reworked tree splitting.

Moved the logic from the axe to the tree library for better handling.
Also, dual splitting with two players is effective now (hasn't been before).
Added Chunk_Wood.

Reworked all trees to split into Chunk_Wood.
Basic buildings are now constructed from Chunk_Wood.

These are:
- Flagpole (until we get another power distributor)
- Foundry
- Sawmill
- Tools Workshop
- Wind Generator
Fixed tree splitting wood output.
Added planks- Get some them from the sawmill.

Reworked quite a lot of production costs to either planks or chunk_wood. Haven't done a thourough search. I expact that soon Chunk_Wood is renamed into Wood anyway, so any errors will solve themselves.
Remove obsolete effect level slider and configuration option