Various fixes and improvements (#435)

- Fix for `sdkconfig` generation: the keys that contained the MCU type in its name weren't properly upper-cased.
- Moved WiFi configuration property files to the user data path of the app instead of a fixed location.
- Moved more properties from `device.py` to `sdkconfig/default.properties`
- Fix for `device.cmake` device id parsing: separate basic property parsing from device id validation
- Created internal `tt::service::wifi::findServiceContext()`
- Changed Wi-Fi service id to lowercase (will change it for other services later)

Tactility/Source/service/wifi/Wifi.cpp

@@ -1,5 +1,8 @@
 #include "Tactility/service/wifi/Wifi.h"
 
+#include <Tactility/service/ServiceManifest.h>
+#include <Tactility/service/ServiceRegistration.h>
+
 namespace tt::service::wifi {
 
 const char* radioStateToString(RadioState state) {
@@ -21,4 +24,10 @@ const char* radioStateToString(RadioState state) {
     tt_crash("not implemented");
 }
 
+extern const ServiceManifest manifest;
+
+std::shared_ptr<ServiceContext> findServiceContext() {
+    return findServiceContextById(manifest.id);
+}
+
 }