Grouped merges for 5.0.14.

- Update `lodash` to the latest version `4.17.21`.
- Disable some attributes for rich text.
- Use hashed/deterministic moduleIDs in webpack config.

Props ellatrix, peterwilsoncc, get_dave, mcsf, talldanwp, youknowriad, desrosj, nerrad, gziolo.
Merges [50940-50941,50984-50985,51426] to the 5.0 branch.

git-svn-id: https://develop.svn.wordpress.org/branches/5.0@51758 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj