Added chmod perm, modal to change, api with local/ftp/sftp (#399)

Read a fill current permissions for local driver

Finished permissions for ftp driver, read and change

Read permissions for sftp adapter

Created FilegatorFtp for a cleaner permissions integration

Implemented recursive chmod options for files/folders

Modified tests to cover permissions

Lint frontend permissions component

frontend/api/api.js

@@ -119,6 +119,17 @@ const api = {
         .catch(error => reject(error))
     })
   },
+  chmodItems(params) {
+    return new Promise((resolve, reject) => {
+      axios.post('chmoditems', {
+        permissions: params.permissions,
+        items: params.items,
+        recursive: params.recursive,
+      })
+        .then(res => resolve(res.data.data))
+        .catch(error => reject(error))
+    })
+  },
   removeItems(params) {
     return new Promise((resolve, reject) => {
       axios.post('deleteitems', {