Resolves the file that is included by the given include directive. May return {@code null}
	 * in case the file cannot be found. This is usually more efficient than using:
	 * <pre>
	 * getFiles(include.getIncludesLocation())
	 * </pre>
Resolves the file that is included by the given include directive. May return {@code null}
	 * in case the file cannot be found. This is usually more efficient than using:
	 * <pre>
	 * getFiles(include.getIncludesLocation())
	 * </pre> | IIndex.java