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Broken by a69963ab

The slip tool allows to move in and out point of a (cut) clip by a certain amount while position and size of the clip stay the same.

Related to #1069

Commit includes:
- basis for advanced trimming tools (e.g. trimming preview in monitor)
- make editing tool available as enum in qml
- add slip tool
- add tests for slip

Related to #1141

Add option to lock/unlock guides. Unlocked guides will move along when using spacer tool or adding/removing space

Related to #990

Fix mouse wheel over track head should scroll vertical

Fix master effect zones hidden in recent change, ensure moving a zone with mouse always sticks to frames
Related to #990

Monitor overlay: use guide category as background color, ensure guide at timeline position appears above others
Related to #990

Timeline ruler: small UI improvements (add left/right handles to zones, move preview markers to bottom)
Related to #990

Cleanup timeline guides: increase number of guides categories(9), move guide label above timeline ruler.
Related to #990 #547

*Minor qml optimizations