Implemented functions for working with cursor in the new class CBlockLevelSdt, also these functions were refactored in a whole project. Implemented function for clearing paragraph formatting in the new class CBlockLevelSdt.

v4.3.2 v4.3.2

* 'develop' of https://github.com/ONLYOFFICE/sdkjs: (32 commits)
  notes
  Implemented AddOleObject, EditOleObject.
  AddInlineImage
  Implemented AddInlineImage.
  Implemented GetNumberingInfo.
  The work of the shrink option is updated. fix bug 31634
  notes; fix Bug 34764
  Implemented set/get content selection for the new CBlockLevelSdt class.
  Continue implementing the new class CBlockLevelSdt.
  Update Readme.md
  update build readme
  Selection_Is_OneElement were replaced with GetSelectDirection.
  Implemented IsTableBorder and IsMovingTableBorder functions in the new CBlockLevelSdt class.
  open notesMasters rels
  Keep working on the new class CBlockLevelSdt.
  fix bug 29327
  fix bug 31633
  Implementing adding new paragraph in the new class CBlockLevelSdt.
  fix jszip get images from changes
  Implemented moving cursor right/left in the new class CBlockLevelSdt.
  ...

fix bug 31634

Update Readme.md