Improvements to the usability of the number entry widgets (Priority, Level Emitter, Craft Amount): (#4737)

- Fixed tab order
- Introduced focus state for corner buttons
- Allowed the player to enter any text, but add validation that only persist it if it is a valid number
- Enter will now confirm these dialogs and return to the previous dialog
- The text field is automatically focused and its contents are selected

src/main/java/appeng/container/implementations/IOPortContainer.java

@@ -34,7 +34,6 @@ import appeng.container.guisync.GuiSync;
 import appeng.container.slot.OutputSlot;
 import appeng.container.slot.RestrictedInputSlot;
 import appeng.tile.storage.IOPortTileEntity;
-import appeng.util.Platform;
 
 public class IOPortContainer extends UpgradeableContainer {
 
@@ -111,7 +110,7 @@ public class IOPortContainer extends UpgradeableContainer {
     public void detectAndSendChanges() {
         this.verifyPermissions(SecurityPermissions.BUILD, false);
 
-        if (Platform.isServer()) {
+        if (isServer()) {
             this.setOperationMode(
                     (OperationMode) this.getUpgradeable().getConfigManager().getSetting(Settings.OPERATION_MODE));
             this.setFullMode(