- In Android 10+ use picker to choose TLS Certificate and TLS CA Files

- Ask confirmation to reset settings to factory defaults
- Replaced downloadsPath companion variable with Utils function call
- Fixed several Kotlin lint warnings

app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt

@@ -63,7 +63,6 @@ class BaresipService: Service() {
         intent.setPackage("com.tutpro.baresip")
 
         filesPath = filesDir.absolutePath
-        downloadsPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).path
 
         am = getSystemService(Context.AUDIO_SERVICE) as AudioManager
 
@@ -1193,7 +1192,6 @@ class BaresipService: Service() {
         var dynDns = false
         var netInterface = ""
         var filesPath = ""
-        var downloadsPath = ""
         var logLevel = 2
         var sipTrace = false
         var callActionUri = ""