Added glob patterns to the syntax shapes

Bare words now represent literal file names, and globs are a different
syntax shape called "Pattern". This allows commands like `cp` to ask for
a pattern as a source and a literal file as a target.

This also means that attempting to pass a glob to a command that expects
a literal path will produce an error.

src/shell/helper.rs

@@ -123,6 +123,10 @@ fn paint_token_node(token_node: &TokenNode, line: &str) -> String {
             item: RawToken::Size(..),
             ..
         }) => Color::Purple.bold().paint(token_node.span().slice(line)),
+        TokenNode::Token(Tagged {
+            item: RawToken::GlobPattern,
+            ..
+        }) => Color::Cyan.normal().paint(token_node.span().slice(line)),
         TokenNode::Token(Tagged {
             item: RawToken::String(..),
             ..