enable filter works with table api(not in the footer)

[alswl]

We already have keyword filtering, but this can only be displayed in the footer of the form. If I want a form without a footer, or if I want to have the ability to manually control the filtering feature, I need an API to connect to the form to manipulate it.

Before:

A filtered simple default table
Currently filter by Title and Author, press / + letters to start filtering, and escape to clear filter.
Press q or ctrl+c to quit

┏━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃        Title┃       Author┃                                       Description┃
┣━━━━━━━━━━━━━╋━━━━━━━━━━━━━╋━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┫
┃Computer Sys…┃Randal E. Br…┃This book explains the important and enduring con…┃
┃Structure an…┃Harold Abels…┃Structure and Interpretation of Computer Programs…┃
┣━━━━━━━━━━━━━┻━━━━━━━━━━━━━┻━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┫
┃                                                                     /com  1/1┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

New sytle:

A filtered simple default table
Currently filter by Title and Author, press / + letters to start filtering, and escape to clear filter.
Press q or ctrl+c to quit

> com 
┏━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃        Title┃       Author┃                                       Description┃
┣━━━━━━━━━━━━━╋━━━━━━━━━━━━━╋━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┫
┃Computer Sys…┃Randal E. Br…┃This book explains the important and enduring con…┃
┃Structure an…┃Harold Abels…┃Structure and Interpretation of Computer Programs…┃
┗━━━━━━━━━━━━━┻━━━━━━━━━━━━━┻━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

[Evertras]

I generally agree with the idea of this, just some things that I think we should clarify.

[alswl]

ping @Evertras

[Evertras]

Ah, sorry! LGTM now, will merge/release.