New Customization

### Problem description

It will be better if more of the widgets can be customized individually with more options.

### Expected behavior

I will like to be able to customize the following widgets with the following:
TextInput - border
TextView - text-shadow,more font-type like open-sans,etc
All - background-gradient,padding,margin,border, box-shadow etc

THEME
There should be more theme color type specified for custom theme styling. E.g. setting default text primary color, using gradient colors, etc
I also noticed that some widget doesn't use theme color by default, e.g. button which is not proper. If the tab widget can use theme color, every other widget should too unless other color is specificied in the the widget.
NOTE: color is both background and text.

The video widget doesn't work properly with audio, if its possible, a standalone audio widget is better.
### Environment

- Tabris.js version: 3.0

### Code snippet