Add AllowIme => false where applicable

Also adds `AllowWordNavigation => false` to password text box.

osu.Game/Graphics/UserInterface/OsuNumberBox.cs

@@ -7,6 +7,8 @@ namespace osu.Game.Graphics.UserInterface
 {
     public class OsuNumberBox : OsuTextBox
     {
+        protected override bool AllowIme => false;
+
         protected override bool CanAddCharacter(char character) => character.IsAsciiDigit();
     }
 }

osu.Game/Graphics/UserInterface/OsuPasswordTextBox.cs

@@ -29,6 +29,10 @@ namespace osu.Game.Graphics.UserInterface
 
         protected override bool AllowClipboardExport => false;
 
+        protected override bool AllowWordNavigation => false;
+
+        protected override bool AllowIme => false;
+
         private readonly CapsWarning warning;
 
         [Resolved]

osu.Game/Overlays/Settings/SettingsNumberBox.cs

@@ -68,6 +68,8 @@ namespace osu.Game.Overlays.Settings
 
         private class OutlinedNumberBox : OutlinedTextBox
         {
+            protected override bool AllowIme => false;
+
             protected override bool CanAddCharacter(char character) => character.IsAsciiDigit();
 
             public new void NotifyInputError() => base.NotifyInputError();

osu.Game/Screens/Edit/Setup/LabelledRomanisedTextBox.cs

@@ -13,6 +13,8 @@ namespace osu.Game.Screens.Edit.Setup
 
         private class RomanisedTextBox : OsuTextBox
         {
+            protected override bool AllowIme => false;
+
             protected override bool CanAddCharacter(char character)
                 => MetadataUtils.IsRomanised(character);
         }