style updates

[arnetheduck]

• more compact import/type/var/let/const/etc sections when subnodes are simple
• fix infix line breaks
• single indent in proc forward declarations and typedefs - double when there's a body
• if/elif/except/while condition double indent when needed
• comma at end of one-per-line lists when permissible
  • helps git merges when adding to the list
• literals are considered "simple" for list formatting
• empty brackets are not linebroken