Release 1.2.0

Release Candidate!

Edits, deletions and now insertions are migrated through code motion!

Features:

#30 - Migrate insertions through code motion via anchors.

#38 - Issue a diagnostic for moves, especially for diverging moves.

Bugfixes:

#39 - Misleading log messages regarding match window sizes plus some quick-win performance optimisations.

#40 - MatchError faults Kinetic Merge when merging a file deleted on one side and modified on another.

#42 - Fix poor merge due to trailing shared context being treated as an extended insertion.

#43 - Filling gaps with one-token sections makes for odd-looking merges.