Generalized the handlebars code.

include/dawn/util/string.h

@@ -0,0 +1,19 @@
+/**
+ * Copyright (c) 2021 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "../libs.h"
+
+#define STRING_HANDLEBAR_KEY_MAXLENGTH 32
+
+/** Representation of a String Handlebar Variable */
+typedef struct {
+  /** The key to use to replace in the source */
+  char *key;
+  /** The value to replace it with */
+  char *value;
+} stringhandlebarvariable_t;