Added class for working with ContentControl through a plugins api. Implemented function for removing ContentControl from the document.

delete unused setMobileVersion

Feature/special paste word

* 'develop' of https://github.com/ONLYOFFICE/sdkjs:
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  Fixed bug with moving borders of a flowing table.
  delete underscore from build
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  open/save some sdtPr properties
  sdkAllCashe -> sdkAllCache
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  delete tasks from configs
  add constructor in prototype
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  open/save csv with user defined delimiters
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  delete unused function
  bugs