Allow different syntactic elements have different indentation

[vladima]

Original issue: [st3] keeps indenting by 4 ws when typing

[mprobst]

Or more precisely: many styles require indentation depth to go up by some amount (e.g. +2 ws) for syntactical structures that introduce nesting (blocks, conditional branches, loop bodies, object literals, etc). But when a line is too long and must be wrapped, it should visually stand out from normal indentation, which is achieved by doubling the indent, e.g. +4 ws.