267| New shortcuts

Description of feature

• Main:
  • ctrl UP/DOWN: change current track
  • Shift + LMB: Select several sequences -> Button to set preview range on selected
  • Numpad: Change current displayed track to the track number
• Adv. Drawing:
  • up/down: jump keyframe backwd/fwd

How to test it

Use Stax

Checklist

Please check if your MR fulfills the following requirements:

• Unit tests have been added, if possible
• Documentation has been updated
• Build was run locally and any changes were pushed
• Lint has passed locally without error
• CHANGELOG.md has been updated

FYI: @strangenoise