Layered Image

[randaz81]

• added new datatype yarp::sig::LayeredImage with test
• modified yarpopencvdisplay to support yarp::sig::LayeredImage
• added yarp::sig::utils::sum() to transform ayarp::sig::LayeredImage to yarp::sig::Image

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would update the release notes by adding a file in doc/release/<target_branch>, based on your changes.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +36.35%	✅ 92.45%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (6b4bb23)	425435	79614	18.71%
Head commit (1cdaf44)	112184 (-313251)	61777 (-17837)	55.07% (+36.35%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#3155)	424	392	92.45%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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