ConfigurableExtension(PreferenceScreen) support (#163)

* initial PreferenceScreen support, works with 'NeoXXX Scans' (pt-br)

* convert EditTextPreference to json successfully

* commit what I've got

* bring back the old SharedPreferences for CustomContext, implement Toast

* put back syer's implementation

build.gradle.kts

@@ -84,5 +84,8 @@ configure(projects) {
 
         // APK parser
         implementation("net.dongliu:apk-parser:2.6.10")
+
+        // Jackson
+        implementation("com.fasterxml.jackson.core:jackson-annotations:2.10.3")
     }
 }