public void writeExtensionPointClassFile() throws IOException {
			ZipEntry entry = new ZipEntry(ROOT_GHIDRA + "EXTENSION_POINT_CLASSES");

			try {
				jarOut.putNextEntry(entry);
			}
			catch (ZipException e) {
				System.out.println(e.getMessage());
				return;
			}
			for (String extensionPointClass : extensionPointClasses) {
				jarOut.write(extensionPointClass.getBytes());
				jarOut.write('\n');
			}

			jarOut.closeEntry();
		}
Puts a directory in the jar for Ghidra Extensions. This may be empty (if
no extensions are installed) but should exist nonetheless.

@throws IOException if there's an error writing to the jar
Ghidra/Features/Base/src/main/java/ghidra/util/GhidraJarBuilder.java