Update properties parsing for app manifest and device manifest files (#544)

Devices/lilygo-tdongle-s3/device.properties

@@ -1,26 +1,21 @@
-[general]
-vendor=LilyGO
-name=T-Dongle S3
-incubating=true
+general.vendor=LilyGO
+general.name=T-Dongle S3
+general.incubating=true
 
-[apps]
-launcherAppId=Launcher
-autoStartAppId=ApWebServer
+apps.launcherAppId=Launcher
+apps.autoStartAppId=ApWebServer
 
-[hardware]
-target=ESP32S3
-flashSize=16MB
-spiRam=false
-tinyUsb=true
-esptoolFlashFreq=120M
-bluetooth=true
+hardware.target=ESP32S3
+hardware.flashSize=16MB
+hardware.spiRam=false
+hardware.tinyUsb=true
+hardware.esptoolFlashFreq=120M
+hardware.bluetooth=true
 
-[display]
-size=0.96"
-shape=rectangle
-dpi=186
+display.size=0.96"
+display.shape=rectangle
+display.dpi=186
 
-[lvgl]
-colorDepth=16
-uiDensity=compact
-fontSize=10
+lvgl.colorDepth=16
+lvgl.uiDensity=compact
+lvgl.fontSize=10