Added some extra checks into StringMapType serialization, so that null values are not serialized.
Fixed BlockChangedEvents not being sent when the player places a block.
Adds some more properties and tweaks all things related to HDR rendering (in combination with the recent post-processing effect additions).
Increased initial distance for dropped blocks and made inventories persistent for dropped blocks.
* increased distance to 2, blocks thrown away while looking down are no longer picked up directly
* removed deprecated method use
* store placedEntity for dropped blocks

Fixes #310
Merge pull request #443 from skaldarnar/develop

Increased initial distance for dropped blocks and made inventories persi...