Minor misc. fixes (#4729)

* [Simulator] Remove extraneous format value in microsTimer; Better way to delete SimulatorStartupDialog (in case no event loop starts).

* [Simulator] No helpers dependency for SimulatorStartupDialog.

* [simpgmspace] Rename micros timer function and make externally available.

* [Companion] Fix possible uninitialized value in TreeModel (compiler warning).

* [multi_arm] Fix minor compiler warning (MSVC: "unsafe mix of type 'uint8_t' and type 'bool' in operation").

* [lua] Fix compiler warning ("'data' may be used uninitialized in this function").

* [OpenTxSimulator] Fix analogs array range.

* [Simulator] Auto-start simulator when SimulatorMainWindow is first shown (vs. before it was shown).

* [Simulator] DebugOutput: prevent possible mutex deadlock on buffer overflow (force queued connection for Qt < 5.3).

* [Companion] Display calibration data for Horus joysticks (MOUSE1/MOUSE2)

companion/src/modelslist.cpp

@@ -265,7 +265,7 @@ void TreeModel::refresh()
   for (unsigned i=0; i<radioData->models.size(); i++) {
     ModelData & model = radioData->models[i];
     int currentColumn = 0;
-    TreeItem * current;
+    TreeItem * current = NULL;
     if (IS_HORUS(board)) {
       if (!model.isEmpty()) {
         TreeItem * categoryItem;
@@ -290,7 +290,7 @@ void TreeModel::refresh()
       current->setData(currentColumn++, QString().sprintf("%02d", i + 1));
     }
 
-    if (!model.isEmpty()) {
+    if (!model.isEmpty() && current) {
       QString modelName;
       if (strlen(model.name) > 0)
         modelName = model.name;