- renamed assembler_runner to just assembler

- implemented type parsing including custom types and generics (useless
  for now as we do no semantic analysis)
- implemented struct literal parsing
- implemented struct definition parsing (no generics yet)
- implemented tuple parsing
- registers are now allocated starting from zero
- updated to-dos

assembler/Cargo.toml

@@ -5,7 +5,7 @@ edition.workspace = true
 authors.workspace = true
 
 [[bin]]
-name = "assembler_runner"
+name = "assembler"
 path = "src/main.rs"
 
 [lib]