Leaflet set view

[mj3cheun]

About

Feature feedback response

Description of changes

• Updates to the latest ver of cy-leaflet to solve elements update artifacts issue
• Add view property to leaflet to leaflet object
• Add coordinate property to contextmenu output if leaflet is enabled
• Minor bugfixes

Pre-Merge checklist

• The project was correctly built with npm run build:all.
• If there was any conflict, it was solved correctly.
• All changes were documented in CHANGELOG.md.
• All tests on CircleCI have passed.
• All Percy visual changes have been approved.
• Two people have 💃'd the pull request. You can be one of these people if you are a Dash Cytoscape core contributor.

Reference Issues

Closes #[issue number]

Other comments

[mtwichan]

💃