Keyframe editor

[hoshiryu]

UPDATE the form below to describe your PR.

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Be aware that the PR request cannot be accepted if it doesn't pass the Continuous Integration tests.

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  This PR adds a KeyFramedValue editor to the Timeline UI.
  It is now possible to keyframe (almost) any data (see Docs/timeline.md for more informations).

• What is the current behavior? (You can also link to an open issue here)

• What is the new behavior (if this is a feature change)?

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

• Other information:

Should be merged after #542

See also branches animate_camera and timeline_examples from the plugins repository, for practical examples on how to animate an entity and a camera transform or the position / normal of a mesh vertex (not finalized though).

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[nmellado]

Here is an overview of what got changed by this pull request:

Clones added
============
- src/GuiBase/KeyFrameEditor/KeyFrameEditorScrollArea.cpp  3
- src/GuiBase/KeyFrameEditor/KeyFrameEditorFrame.hpp  2
- src/GuiBase/KeyFrameEditor/KeyFrameEditorFrame.cpp  13
- src/GuiBase/KeyFrameEditor/KeyFrameEditor.hpp  1
- src/GuiBase/Timeline/TimelineFrameSelector.hpp  1
- src/GuiBase/KeyFrameEditor/KeyFrameEditorScrollArea.hpp  1
         

See the complete overview on Codacy

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[nmellado]

Do we keep this PR open ?
It has several conflicts, is someone confident to fix it ?

[dlyr]

Let's make it draft, I'll keep it in the todo list (we can also clean an postpone ...)