Replace the global `io` singleton object with a static `IO` class, moving the `write` native from the instance to the metaclass. Update all benchmark, example, and test files to use `IO.write()` instead of `io.write()`.
Add a new case in the `readRawToken` function within `src/wren_compiler.c` to map the semicolon character to the `TOKEN_LINE` token type, enabling semicolons to function as line separators in the Wren language parser.
Include a test file `test/semicolon.wren` that verifies the new behavior by using a semicolon to separate two statements on a single line, with the expected output "ok".
