Update tslint rules

[maximwow70]

• Include missing space rule
• Make lint fail if get does not contain explicitly set visibility public/private
• public methods should be above private ones

[rat6666]

I'm not sure if we can fix this problem with tslint because the rule works, but when the curly brace goes after the "return" word tslint does not show an error

[Tanyashinke]

Seems like rules 'whitespace' and 'one-line' work fine expect case when space needed between return and curly braces.