New features(Export annotations in RLE, Visualize semantic segmentation ...)

[Chaimaa-Louahabi]

1. Allow the user to choose the simplification degree for polygon and brush tools (if equal to 0, the original mask is saved and no simplification is done) (Issue #388 )

Brush Panel: Polygon Panel:

2. Eraser Tool optimization : does not substract current eraser path from annotation path until mouse up event is catched.(solution inspired from #364 )

3. Masks created with brush Tool have Bézier curves to allow annotating objects with curves accurately. These annotations are exported in Compressed RLE format.

4. New feature : download an Image’s semantic segmentation in PNG format.

The new button in annottaor vue:

Example of fire and clouds annotations (Annotations were created manually with brush tool):

5. New feature : download a zip containing the semantic segmentation of each image of the dataset. The zip can be found in "Exports", it has the tag "SemanticSeg"

6. BugFix : when importing annotations that are lines or points, they disappear when one clicks on the image. It's due to a bug in boolean operations algorithm used in Paperjs Open Issue (unite, substract ..) so these 2 cases must be handled separately.

[jsbroks]

Once these merge conflicts are solved Ill merge this

[ariefwijaya]

Once these merge conflicts are solved Ill merge this

@jsbroks any update?