Settings refactor (#1615)

* Refactor main preferences to use DSL

* Refactor account preferences to use DSL

* Use DSL in rest of the preference screens

* Preferences cleanup

* Fix preference dependencies

app/src/main/java/com/keylesspalace/tusky/settings/SettingsDSL.kt

@@ -0,0 +1,83 @@
+package com.keylesspalace.tusky.settings
+
+import android.content.Context
+import androidx.annotation.StringRes
+import androidx.preference.*
+import com.keylesspalace.tusky.EmojiPreference
+
+class PreferenceParent(
+        val context: Context,
+        val addPref: (pref: Preference) -> Unit
+)
+
+inline fun PreferenceParent.preference(builder: Preference.() -> Unit): Preference {
+    val pref = Preference(context)
+    addPref(pref)
+    builder(pref)
+    return pref
+}
+
+inline fun PreferenceParent.listPreference(builder: ListPreference.() -> Unit): ListPreference {
+    val pref = ListPreference(context)
+    addPref(pref)
+    builder(pref)
+    return pref
+}
+
+inline fun PreferenceParent.emojiPreference(builder: EmojiPreference.() -> Unit): EmojiPreference {
+    val pref = EmojiPreference(context)
+    addPref(pref)
+    builder(pref)
+    return pref
+}
+
+inline fun PreferenceParent.switchPreference(
+        builder: SwitchPreference.() -> Unit
+): SwitchPreference {
+    val pref = SwitchPreference(context)
+    addPref(pref)
+    builder(pref)
+    return pref
+}
+
+inline fun PreferenceParent.editTextPreference(
+        builder: EditTextPreference.() -> Unit
+): EditTextPreference {
+    val pref = EditTextPreference(context)
+    addPref(pref)
+    builder(pref)
+    return pref
+}
+
+inline fun PreferenceParent.checkBoxPreference(
+        builder: CheckBoxPreference.() -> Unit
+): CheckBoxPreference {
+    val pref = CheckBoxPreference(context)
+    addPref(pref)
+    builder(pref)
+    return pref
+}
+
+inline fun PreferenceParent.preferenceCategory(
+        @StringRes title: Int,
+        builder: PreferenceParent.(PreferenceCategory) -> Unit
+) {
+    val category = PreferenceCategory(context)
+    addPref(category)
+    category.setTitle(title)
+    val newParent = PreferenceParent(context) { category.addPreference(it) }
+    builder(newParent, category)
+}
+
+inline fun PreferenceFragmentCompat.makePreferenceScreen(
+        builder: PreferenceParent.() -> Unit
+): PreferenceScreen {
+    val context = requireContext()
+    val screen = preferenceManager.createPreferenceScreen(context)
+    val parent = PreferenceParent(context) { screen.addPreference(it) }
+    // For some functions (like dependencies) it's much easier for us if we attach screen first
+    // and change it later
+    preferenceScreen = screen
+    builder(parent)
+    return screen
+}