Auto-import std::core. Fix module assignment of declarations. Introspection improvements. Deref null error panics in safe mode. Support for LLVM 15

lib/std/core/string_iterator.c3

@@ -0,0 +1,25 @@
+module std::core::string::iterator;
+
+
+
+struct StringIterator
+{
+	char[] utf8;
+	usize current;
+}
+
+fn void StringIterator.reset(StringIterator* this)
+{
+	this.current = 0;
+}
+
+fn Char32! StringIterator.next(StringIterator* this)
+{
+	usize len = this.utf8.len;
+	usize current = this.current;
+	if (current >= len) return IteratorResult.NO_MORE_ELEMENT!;
+	int read = (int)(len - current < 4 ? len - current : 4);
+	Char32 res = str::utf8CharTo32(&this.utf8[current], &read)?;
+	this.current += read;
+	return res;
+}