Added "Yotsuba" theme (#5290)

(cherry picked from commit 9b967177c5)

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceValues.kt

@@ -22,6 +22,7 @@ object PreferenceValues {
         default,
         blue,
         strawberrydaiquiri,
+        yotsuba
     }
 
     // Keys are lowercase to match legacy string values

app/src/main/java/eu/kanade/tachiyomi/ui/base/activity/BaseThemedActivity.kt

@@ -43,6 +43,7 @@ abstract class BaseThemedActivity : AppCompatActivity() {
                 LightThemeVariant.default -> R.style.Theme_Tachiyomi_Light
                 LightThemeVariant.blue -> R.style.Theme_Tachiyomi_Light_Blue
                 LightThemeVariant.strawberrydaiquiri -> R.style.Theme_Tachiyomi_Light_StrawberryDaiquiri
+                LightThemeVariant.yotsuba -> R.style.Theme_Tachiyomi_Light_Yotsuba
             }
         }
         setTheme(themeId)

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsGeneralController.kt

@@ -139,12 +139,14 @@ class SettingsGeneralController : SettingsController() {
                 entriesRes = arrayOf(
                     R.string.theme_light_default,
                     R.string.theme_light_blue,
-                    R.string.theme_light_strawberrydaiquiri
+                    R.string.theme_light_strawberrydaiquiri,
+                    R.string.theme_light_yotsuba
                 )
                 entryValues = arrayOf(
                     Values.LightThemeVariant.default.name,
                     Values.LightThemeVariant.blue.name,
-                    Values.LightThemeVariant.strawberrydaiquiri.name
+                    Values.LightThemeVariant.strawberrydaiquiri.name,
+                    Values.LightThemeVariant.yotsuba.name
                 )
                 defaultValue = Values.LightThemeVariant.default.name
                 summary = "%s"