Allows setting a mask used for block traces. This allows brush tools to
pass through various materials, such as water (e.g. `/tracemask #solid`
or `/tracemask !air,water`) before starting to build.
By default, a null mask is equivalent to #existing (original behavior).
https://gfycat.com/ImmaculateFrayedCockatiel
- Move Vector, etc. into `.math` package
- Drop many methods that will be auto-promoted anyways, eg. with
`divide(int)` and `divide(double)` the first is now gone.
- Take Block vectors into their own class hierarchy
- Make it clear throughout the API what takes blockvectors
- many more improvements
This converts the project into a multi-module Gradle build.
By default, Git does not show history past a rename, so use git log
--follow to see further history.
