Merge PR # 1176 by @msteiger - lib updates

Fix dropped items being invisible

Merge pull request MovingBlocks#1082 from msteiger/join_server

Add message box dialogs for long-running operations

Update readme for stable build

Doc updates for stable build. New included modules: CakeLie, CopperAn…

…dBronze, Journal, Minimap, MultiBlock, Workstation, Zones

Doc update for stable build

Various findbugs related fixes.

Logging tweak

Port a quick fix from @immortius to multiplayer branch in preparation…

… of making a one-time stable build before retiring it soon.

Adds volumetric fog shadow prototype - approach can be compared to th…

…e effect seen in Crysis 3.

* Adds inscattering as a rendering property (default is enabled)
* Adds some minor other rendering related cleanups and tweaks