Increased the right margin of sent messages for better visibility.
Merge pull request #2273 from ddobrev/xmppchat

Increased the right margin of sent messages for better visibility
Enabled 'Enter' to open the chat. Deleted the now obsolete ChatEntry.
Merge pull request #2279 from ddobrev/xmppchat

Enabled 'Enter' to open the chat. Deleted the now obsolete ChatEntry.
Merge pull request #2260 from ey6es/metavoxels

Yet another metavoxel checkpoint: work on streaming spanners, LOD/subdivision bits, etc.