Remove the need for semicolons after function declarations

[ijchen]

Currently, all statements (notably including function declarations) require a semicolon to terminate them:

fn add(a, b) {
    return a + b;
} // <-- Note the lack of trailing semicolon

add(1, 1);

Syntax Error: unexpected token (invalid token following statement)
| example.ice line 5, col 1 to 3
| 
| add(1, 1);
| ^^^

This is annoying, tedious, and unexpected to programmers coming from other C-like languages. This requirement should be removed.

Unresolved questions:

• Does this have to be a special case, or can we make a more general change to the syntax of the language?
• What role does a semicolon fulfill / what is its meaning?