Drop support for Android versions below 3.0

Android 3.0 (API level 11) was released in Feb 2011.

These versions were already unsupported due to unavoidable calls to:
- MotionEvent.getActionMasked() (API 8)

And avoidable calls to:
- SharedPreferences.Editor.putStringSet() (API 11)

build.gradle

@@ -8,7 +8,7 @@ android {
 
   defaultConfig {
     applicationId "juloo.keyboard2"
-    minSdk 4
+    minSdk 11
     targetSdkVersion 33
     versionCode 38
     versionName "1.26.0"

srcs/juloo.keyboard2/Config.java

@@ -3,7 +3,6 @@ package juloo.keyboard2;
 import android.content.SharedPreferences;
 import android.content.res.Configuration;
 import android.content.res.Resources;
-import android.os.Build;
 import android.util.DisplayMetrics;
 import android.util.TypedValue;
 import android.view.KeyEvent;
@@ -358,12 +357,9 @@ public final class Config
       case "jungle": return R.style.Jungle;
       default:
       case "system":
-        if (Build.VERSION.SDK_INT >= 8)
-        {
         int night_mode = res.getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK;
         if ((night_mode & Configuration.UI_MODE_NIGHT_NO) != 0)
           return R.style.Light;
-        }
         return R.style.Dark;
     }
   }

srcs/juloo.keyboard2/VibratorCompat.java

@@ -1,7 +1,6 @@
 package juloo.keyboard2;
 
 import android.content.Context;
-import android.os.Build.VERSION;
 import android.os.Vibrator;
 import android.view.HapticFeedbackConstants;
 import android.view.View;
@@ -17,7 +16,6 @@ public final class VibratorCompat
     }
     else
     {
-      if (VERSION.SDK_INT >= 8)
       v.performHapticFeedback(HapticFeedbackConstants.KEYBOARD_TAP,
           HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING);
     }

srcs/juloo.keyboard2/VoiceImeSwitcher.java

@@ -27,8 +27,6 @@ class VoiceImeSwitcher
   public static boolean switch_to_voice_ime(InputMethodService ims,
       InputMethodManager imm, SharedPreferences prefs)
   {
-    if (VERSION.SDK_INT < 11) // Due to InputMethodSubtype
-      return false;
     List<IME> imes = get_voice_ime_list(imm);
     String last_used = prefs.getString(PREF_LAST_USED, null);
     String last_known_imes = prefs.getString(PREF_KNOWN_IMES, null);
@@ -46,8 +44,6 @@ class VoiceImeSwitcher
   public static boolean choose_voice_ime(InputMethodService ims,
       InputMethodManager imm, SharedPreferences prefs)
   {
-    if (VERSION.SDK_INT < 11) // Due to InputMethodSubtype
-      return false;
     List<IME> imes = get_voice_ime_list(imm);
     choose_voice_ime_and_update_prefs(ims, prefs, imes);
     return true;