Implement ast dumping and start treewalker

src/main.zig

@@ -1,6 +1,7 @@
 const std = @import("std");
 const tokenize = @import("tokenizer.zig").tokenize;
 const parse = @import("parser.zig").parse;
+const treewalk = @import("treewalker.zig").interpret;
 
 pub fn main() !void
 {
@@ -35,5 +36,5 @@ pub fn main() !void
 	var parserAllocator = std.heap.ArenaAllocator.init(std.heap.page_allocator);
 	defer parserAllocator.deinit();
 	const root = try parse(tokens, &parserAllocator);
-	root.dump(0);
+	try treewalk(root, allocator);
 }