android: Convert Setting to Kotlin

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/model/Setting.kt

@@ -1,4 +1,4 @@
-package org.yuzu.yuzu_emu.features.settings.model;
+package org.yuzu.yuzu_emu.features.settings.model
 
 /**
  * Abstraction for a setting item as read from / written to yuzu's configuration ini files.
@@ -6,37 +6,19 @@ package org.yuzu.yuzu_emu.features.settings.model;
  * must be inferred at read-time. The type of value determines which child of this class is used
  * to represent the Setting.
  */
-public abstract class Setting {
-    private String mKey;
-    private String mSection;
-
-    /**
-     * Base constructor.
-     *
-     * @param key     Everything to the left of the = in a line from the ini file.
-     * @param section The corresponding recent section header; e.g. [Core] or [Enhancements] without the brackets.
-     */
-    public Setting(String key, String section) {
-        mKey = key;
-        mSection = section;
-    }
-
+abstract class Setting(
     /**
      * @return The identifier used to write this setting to the ini file.
      */
-    public String getKey() {
-        return mKey;
-    }
-
+    val key: String,
     /**
      * @return The name of the header under which this Setting should be written in the ini file.
      */
-    public String getSection() {
-        return mSection;
-    }
+    val section: String
+) {
 
     /**
      * @return A representation of this Setting's backing value converted to a String (e.g. for serialization).
      */
-    public abstract String getValueAsString();
+    abstract val valueAsString: String
 }