Fixes and improvements (#132)

- Fix glitch when turning on WiFi: It would temporarily show "No networks found" right before starting the first scan.
- Fix spinner to use Assets.h
- Replace statusbar battery icons 
- Better statusbar icon for when WiFi is on but not connected
- Replace statusbar WiFi icons and Wifi Manage RSSI/lock icons
- Fix for crash when timer is null in I2cScanner
- Deprecate Spacer
- Fixes for toolbar layout (simplified)
- Improved ImageViewer app: center image and add filename text on the bottom
- Add LV debug params to sdkconfig.developer
- Disabled LV spinner, msgbox and window widgets. These have equivalents in Tactility.

Tactility/Source/app/wifimanage/State.h

@@ -11,7 +11,8 @@ namespace tt::app::wifimanage {
 class State {
 
     Mutex mutex = Mutex(Mutex::TypeRecursive);
-    bool scanning;
+    bool scanning = false;
+    bool scannedAfterRadioOn = false;
     service::wifi::WifiRadioState radioState;
     std::vector<service::wifi::WifiApRecord> apRecords;
     std::string connectSsid;
@@ -22,6 +23,8 @@ public:
     void setScanning(bool isScanning);
     bool isScanning() const;
 
+    bool hasScannedAfterRadioOn() const { return scannedAfterRadioOn; }
+
     void setRadioState(service::wifi::WifiRadioState state);
     service::wifi::WifiRadioState getRadioState() const;