... and more style fixups

This batch contains more ludicrous fixes like indentation, and may therefore be more controversial.

Although the big indentation commit doesn't do anything opinionated like coding style changes, it strictly limits itself to indentation errors (2-space, 3-space, 5-space, 8-space indentation ...).

(I'll also add that this is the last big batch. After adding the eslint configuration there's another batch to shut up false positives, but it's much smaller.)