keyboard should have its own text_entry buffer var instead of using buffer everywhere in application layer

[zxkmm]

Description of the feature you're suggesting.

• Keypad should have its own text_entry buffer var instead of using buffer everywhere in application layer, because it doesn't make sense and won't save much.
• should pass as copy instead of ref.
• if you designed this policy, it would be so nice of you to tell me why the original design, so i can know which one is better, thank you!

Anything else?

No response