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

Devices/heltec-wifi-lora-32-v3/device.properties

@@ -1,30 +1,24 @@
-[general]
-vendor=Heltec
-name=WiFi LoRa 32 v3
-incubating=true
+general.vendor=Heltec
+general.name=WiFi LoRa 32 v3
+general.incubating=true
 
-[apps]
-launcherAppId=Launcher
-autoStartAppId=ApWebServer
+apps.launcherAppId=Launcher
+apps.autoStartAppId=ApWebServer
 
-[hardware]
-target=ESP32S3
-flashSize=8MB
-spiRam=false
-tinyUsb=true
-esptoolFlashFreq=120M
-bluetooth=true
+hardware.target=ESP32S3
+hardware.flashSize=8MB
+hardware.spiRam=false
+hardware.tinyUsb=true
+hardware.esptoolFlashFreq=120M
+hardware.bluetooth=true
 
-[display]
-size=0.96"
-shape=rectangle
-dpi=149
+display.size=0.96"
+display.shape=rectangle
+display.dpi=149
 
-[cdn]
-infoMessage=Due to the small size of the screen, the icons don't render properly.
+cdn.infoMessage=Due to the small size of the screen, the icons don't render properly.
 
-[lvgl]
-theme=Mono
-colorDepth=16
-uiScale=70
-uiDensity=compact
+lvgl.theme=Mono
+lvgl.colorDepth=16
+lvgl.uiScale=70
+lvgl.uiDensity=compact