Support an edit-only mode, which brings up the editor without running the app. Helpful if the app hangs the client. Also on mobile, where both don't fit side-by-side.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4405 ed5197a5-7fde-0310-b194-c3ffbd925b24

core/app.js

@@ -127,7 +127,11 @@ function socket(request, response, client) {
 				options.url = message.url;
 				let sessionId = makeSessionId();
 				if (blobId) {
-					process = await core.getSessionProcessBlob(blobId, sessionId, options);
+					if (message.edit_only) {
+						response.send(JSON.stringify({action: 'ready', edit_only: true}), 0x1);
+					} else {
+						process = await core.getSessionProcessBlob(blobId, sessionId, options);
+					}
 				}
 				if (process) {
 					process.app.readOutput(function(message) {