##[ISSUE #23][SEARCH_VIEW] Add the possibility to mark columns, which should be copied during the copy operation

[svlad-90]

1. [X] Have you followed the guidelines in our Contributing document?
2. [X] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
3. [X] Have you built the project, and performed manual testing of your functionality for all supported platforms - Linux and Windows?
4. [X] Is your change backward-compatible with the previous version of the plugin?

Change description:

• Addition of "copy-paste columns" setting to a settings manager
• Addition of corresponding context menu

• Fix bug with unneeded space during copy-paste operation

  Verification criteria:

Manually tested on Windows & Linux