Support saving existing files

resources/assets/scripts/api/server/files/writeFileContents.ts

@@ -0,0 +1,14 @@
+import http from "@/api/http";
+
+export default (server: string, file: string, content: string): Promise<void> => {
+    return new Promise((resolve, reject) => {
+        http.post(`/api/client/servers/${server}/files/write`, content, {
+            params: { file },
+            headers: {
+                'Content-Type': 'text/plain; charset=utf-8',
+            },
+        })
+            .then(() => resolve())
+            .catch(reject);
+    });
+}