HOT-13 first steps
refactor Walkontable setting selections (now is an array of WalkontableSelection)
refs #HOT-13 table in selections
TODO - remove borders + tests

refs #HOT-13
TODO - remove borders + tests

refs #HOT-13
fixes #HOT-13
all borders served by selection enging
tests fixed
borders on hiders as well
Merge branch 'feature/HOT-13' into develop

Conflicts:
	src/3rdparty/walkontable/src/event.js