Resolve "default plugins"

Closes #967 (closed)

changed milestone to %v15.0.0~alpha.2

added enhancement label

added 15 commits

• 1990ff3c...837f6c95 - 7 commits from branch master
• a0e2cece - plugins contain information about being public or not
• e74d5784 - method for updating plugin data created
• e785b1fb - admin can mark plugin as default or not
• b6acc1ac - plugins in admin panel can be revalidated
• b536bc8f - missing bluebird imports
• 68a036e6 - when there is a problem with url ask for plugin removal
• 9814c366 - default plugins in frontend are loaded automatically on map start
• 808c1513 - changelog updated

Compare with previous version

unmarked as a Work In Progress

enabled an automatic merge when the pipeline for 808c1513 succeeds

merged