Hoist helper functions from Selection into Cursor class.

[jenstroeger]

This helper function is useful to check whether the cursor is currently inside of a certain element. For example, within links I want to ignore split and linefeed events:

      if (cursor.getParentContainer('A')) {
        return;
      }

@peyerluk, I think you had implemented a similar function in PR #99 regarding links and not wanting to wrap a link in a link. This PR might support yours?

[jenstroeger]

@peyerluk, I rebased on yesterday’s master.

[jenstroeger]

I removed the getParentContainer() function, and this PR now contains only the hoisted functions in a single commit.

[livingdocs-automation]

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[jenstroeger]

@peyerluk, @marcbachmann, when hoisting these three methods from Selection to Cursor I forgot to adjust the comments, e.g. “Get all tags that affect the current selection.” I think that should be “Get all tags that affect the current cursor or selection.”. Do you care, then I’ll add another PR?