debug_ui: Improve EditText tab

[kjarosh]

This patch adds multiple properties and controls to EditText tab.

This includes for instance:

• border, border color,
• background, background color,
• editable, selectable, word wrap properties,
• autosize, max chars, restrict, etc.

Additionally this fixes a bug when the EditText's bitmap was not invalidated after disabling both border and background (causing them to render regardless).

Before	After