Implement Serial Console app & more (#239)

- Implemented new app: Serial Console
- `Uart::writeString()`: fixed 2 mutex bugs
- `AlertDialog::start()` with default "OK" button added
- Created `tt::lvgl::defaultLockTime` for re-use
- Removed various usages of deprecated `lvgl::obj_set_style_no_padding()`
- Implemented `hal::uart::getNames()` to list all interface names

Tactility/Source/Tactility.cpp

@@ -45,6 +45,7 @@ namespace app {
     namespace log { extern const AppManifest manifest; }
     namespace power { extern const AppManifest manifest; }
     namespace selectiondialog { extern const AppManifest manifest; }
+    namespace serialconsole { extern const AppManifest manifest; }
     namespace settings { extern const AppManifest manifest; }
     namespace systeminfo { extern const AppManifest manifest; }
     namespace textviewer { extern const AppManifest manifest; }
@@ -80,6 +81,7 @@ static void registerSystemApps() {
     addApp(app::inputdialog::manifest);
     addApp(app::launcher::manifest);
     addApp(app::log::manifest);
+    addApp(app::serialconsole::manifest);
     addApp(app::settings::manifest);
     addApp(app::selectiondialog::manifest);
     addApp(app::systeminfo::manifest);