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

Devices/waveshare-s3-lcd-13/device.properties

@@ -1,27 +1,22 @@
-[general]
-vendor=WaveShare
-name=S3 LCD 1.3"
-incubating=true
+general.vendor=WaveShare
+general.name=S3 LCD 1.3"
+general.incubating=true
 
-[apps]
-launcherAppId=Launcher
-autoStartAppId=ApWebServer
+apps.launcherAppId=Launcher
+apps.autoStartAppId=ApWebServer
 
-[hardware]
-target=ESP32S3
-flashSize=16MB
-spiRam=true
-spiRamMode=OCT
-spiRamSpeed=120M
-tinyUsb=true
-esptoolFlashFreq=120M
-bluetooth=true
+hardware.target=ESP32S3
+hardware.flashSize=16MB
+hardware.spiRam=true
+hardware.spiRamMode=OCT
+hardware.spiRamSpeed=120M
+hardware.tinyUsb=true
+hardware.esptoolFlashFreq=120M
+hardware.bluetooth=true
 
-[display]
-size=1.3"
-shape=rectangle
-dpi=261
+display.size=1.3"
+display.shape=rectangle
+display.dpi=261
 
-[lvgl]
-colorDepth=16
-uiDensity=compact
+lvgl.colorDepth=16
+lvgl.uiDensity=compact