Timeline v6.0.0-alpha.7

LOTS of fixes, I think I broke the ability to keep the time while switching layers within a same animation, I'll need to do more testing but I think in terms of function it's getting there. Next build will be beta!

- Show all segments in animations list - Switch to playing segment in animations list
- Improve the Pose screen to make it more discoverable (help text, clearer indications)
- Update help to include layers, segments and sequencing
- Show ellipses when targets names are too long
- Do not reset time to zero when switching layers (both in current animation and synced atoms)
- Fix double-stop applied on every stop click (should only be applied on double click)
- Fix animation sets not working as expected
- Only apply pose when necessary (e.g. do not apply when switching layers)
- Clean handling of deleted and renamed atoms (parent and targets), avoids crash and avoids breaking scenes
- Fix triggers crashing after they are created (works the second time)
- Fix play anim not playing segment if current and stopped
- Consider time offset in peers sync
- Avoid flicker in animations screen when scrubbing
- Avoid sequencing on other atoms when playing clip only
- When syncing selected animation across atom, prefer same layer
- Do not support time offsets on non looping animations
- Apply time offset on stop and/or reset
- Sync time offset with master and when switching animations correctly
- Fix split at scrubber creating empty second anim
- Shorten float params and storable names in dope sheet
- When using segments, auto-play will run shared animations and animations within the first segment only
- Fix switching animation during playback breaking preserve loop
- Fix animations drop down not in sync after switch atom
- Fix crash when launching animation without opening the UI first