Fix text inputs, fix fps cap, falling sand

[0.6.1] - 2016-01-09

Added

• Add spawn command moving client to starting position.
• Add clientDb plugin and move client handling there from server plugin.
• Add falling sand.
• Add removeAll() method to component storage interface.
• Add sand block.
• Command name aliasing. Put | to separate aliases.

Changed

• Change cursor ray distance from 80 to 200.
• Move connection handling from server to net plugin.
• Updated copyrights.
• Server has stop alias of sv_stop now.
• Moved world management from server plugin into world plugin.
• Move server command handling into command plugin.
• Move message command into chat plugin.
• Add checks allowing update of connection when connection is not running.

Fixed

• Fix wrong key supply for imgui not clearing key modifiers.
• Fps limit now works as intended (120 fps by default).