Bump pxt-core to 3.19.4 + Support drive deploy in Electron offline app (#677)

* initial

* Bump pxt-core to 3.19.4 for drive deploy

editor/deploy.ts

@@ -98,11 +98,13 @@ export function deployCoreAsync(resp: pxtc.CompileResult, isCli = false) {
     resp.outfiles[pxtc.BINARY_UF2] = btoa(data)
 
     let saveUF2Async = () => {
-        if (isCli || !pxt.commands.saveOnlyAsync) {
-            return Promise.resolve()
-        } else {
-            return pxt.commands.saveOnlyAsync(resp)
+        if (pxt.commands.electronDeployAsync) {
+            return pxt.commands.electronDeployAsync(resp);
         }
+        if (!isCli && pxt.commands.saveOnlyAsync) {
+            return pxt.commands.saveOnlyAsync(resp);
+        }
+        return Promise.resolve();
     }
 
     if (noHID) return saveUF2Async()

package.json

@@ -40,7 +40,7 @@
   },
   "dependencies": {
     "pxt-common-packages": "0.23.15",
-    "pxt-core": "3.18.17"
+    "pxt-core": "3.19.4"
   },
   "scripts": {
     "test": "node node_modules/pxt-core/built/pxt.js travis"

pxtarget.json

@@ -42,7 +42,7 @@
         "useUF2": true,
         "useELF": true,
         "hasHex": true,
-        "deployDrives": ".*",
+        "deployDrives": "EV3",
         "deployFileMarker": "INFO_UF2.TXT",
         "driveName": "EV3",
         "flashCodeAlign": 256,