0.0.2-rc2

1. Finish mixin cleanup
   No longer screw around with serverside scheduling, should
   improve compatibility with mods that like to do that.

Add at-reason to at-Overwrites

Move client mixins to own package

2. Re-schedule block changes to the main thread
   Fixes #6

3. Fix typo for serialized data (versiom -> version)

4. Clean up skylight propagation code
   Delaying the block sets is now a parameter in the general
   propagate method, and move the delay logic to no longer use a flag
   but to rather call a method later.

So far 0.0.2 looks good, will probably go on CF in the coming
weeks (provided there are no severe issues).