Bug fixes

• Splits: refactor handling infix before left brace (#4862) @kitbellew
• Splits: handle braces within if/for/while better (#4860) @kitbellew
• Infix bugs: fix getting single arg, next operator (#4861) @kitbellew
• Splits: ensure break between yield and case (#4858) @kitbellew
• TreeOps: fix lambda param check a-la fewer-braces (#4856) @kitbellew

Miscellaneous

• Add working "get started" example (#4855) @adamnfish

Build and dependency updates

• Scalameta: upgrade to v4.13.3 (#4863) @kitbellew