Improved selection logic

[peter-yanase]

Fixed typos, did not change the logic.

[peter-yanase]

Bumped dependencies to the lowest versions without known vulnerabilities and removed two unused dependencies.

[peter-yanase]

Added more robust selection logic:

Selects line content if a part a single line is selected or nothing is selected.
Selects whole list (i.e line content + descendants) if multiple lines from single list are selected or the content of a single line is already selected.
Selects parent if the whole list is already selected.
Selects common parent if multiple lists are selected.

Also works with nested task lists - [ ] which the current implementation doesn't support properly.

[AnLuoRidge]

I would prefer areSamePositions() because there're two params. isSamePosition() would make more sense if it is an instance method, used like a.isSamePosition(b).