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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

BUG: 403128
BUG: 403405
BUG: 413567
BUG: 406042
BUG: 407242
BUG: 420319
BUG: 390431
BUG: 377829
BUG: 420428
Fixes #681
Fixes #1005

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

Fixes #271

Related to #407

Related to #407

Update src/dockareaorientationmanager.h, src/dockareaorientationmanager.cpp, src/kdenliveui.rc, src/mainwindow.cpp files

Closes #563

This got lost in the merge of MR !109 and caused the Save Copy entry not
to be visible.

Julius Künzel authored May 10, 2020 and Simon Eugster committed May 21, 2020

Closes #560
MR: !109

Add action to popup the target stream menu (in menu Timeline > Tracks > Switch Target Track Audio Stream)
to enable shortcut activation

*Add got to next/previous guide with CTRL+arrow
related to #563

* Add new option to save current timeline clip as subclip (clip zone)

Implement MLT's new consumer scaling feature. In Monitor menu, you can now select to work in full, 1/2, 1/4 and 1/8 resolution