userspace: Add basic find utility

This is mostly working but is missing -exec and -ok support. It can
search files though :^)

userspace/programs/find/Token.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <BAN/Vector.h>
+
+struct Token
+{
+	enum Type
+	{
+		TOK_NOT,     TOK_LPAREN,    TOK_RPAREN, TOK_CURLIES,
+		TOK_PLUS,    TOK_SEMICOLON, TOK_AND,    TOK_OR,
+		TOK_NAME,    TOK_INAME,     TOK_PATH,   TOK_NOUSER,
+		TOK_NOGROUP, TOK_MOUNT,     TOK_XDEV,   TOK_PRUNE,
+		TOK_PERM,    TOK_TYPE,      TOK_LINKS,  TOK_USER,
+		TOK_GROUP,   TOK_SIZE,      TOK_ATIME,  TOK_CTIME,
+		TOK_MTIME,   TOK_EXEC,      TOK_OK,     TOK_PRINT,
+		TOK_PRINT0,  TOK_NEWER,     TOK_DEPTH,  TOK_LITERAL,
+		TOK_END
+	};
+
+	Type type;
+	const char* string;
+};
+
+BAN::Vector<Token> tokenize(const char* const* strings);