Resolve "plugin functionalities"

Dear @david.hoksza, I implemented all requested functionalities for plugin API. However, I'm not able to provide better Promise responses in setCenter/setZoom functions because those functions call external library that is not using promises. Even though I think you should be able to use other provided methods to achieve the same result.

Closes #702 (closed)

added 11 commits

• 732660be - list of overview images is available via plugin api
• 6be579a9 - ServerConnector is accessed as an object property
• d025155f - allow to show/hide overview image from plugin
• c558e399 - targetting structure constructor accepts a copy of the same object as a parameter
• b968bfca - drug constructor can take another drug as an input
• 7aa060dc - object constructor can take as a parameter object of the same class
• f5076143 - plugin api allows to tigger search on the map
• a878bcc9 - function should return rejected promise instead of throwing error
• efc2bee4 - clear function implemented in js API
• 3eb7247f - jsdoc updated to specify types
• ccfcec24 - changelog updated

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unmarked as a Work In Progress

enabled an automatic merge when the pipeline for ccfcec24 succeeds

changed the description

merged

mentioned in commit c1728d5a