Boot apps refactored (#498)

- Specify launcher via menuconfig
- Specify auto-start app via menuconfig
- Implement more rigid boot.properties fallbacks
- Devices with tiny screen now auto-start ApWebServer
- ApWebServer UI fixes

Devices/waveshare-s3-touch-lcd-147/device.properties

@@ -3,6 +3,10 @@ vendor=WaveShare
 name=S3 Touch LCD 1.47"
 incubating=true
 
+[apps]
+launcherAppId=Launcher
+autoStartAppId=ApWebServer
+
 [hardware]
 target=ESP32S3
 flashSize=16MB
@@ -17,5 +21,8 @@ size=1.47"
 shape=rectangle
 dpi=247
 
+[cdn]
+warningMessage=Touch doesn't work yet
+
 [lvgl]
 colorDepth=16