add more useful functions in the STColumnFilter

[HsinM]

What problem does this feature solve?

Now the STColumnFilter can perfectly execute all kinds of type filter such as keyword, number, date. It would be even better if can add the following functions:
1.extend Enter trigger event to others type filter by default.
2.in the discrete based variable (keyword) filter condition except equal, and add contain, not contain and not equal types.
3.in the continuous based variable (number, date) filter condition except equal, and add >, >=, <, <=, != and range (only number filter, ex. 5~10) types.
4.if possible, let menu and text based filter can coexist, user can freely choose menu or text based filter in the same place to filter data.
I believe this will increase of user UX experience.

What does the proposed API look like?

Extend [number] and [date] configurations.

[cipchk]

I feel that the work is still handed over to the developers, so we adopt a method similar to st-widget to allow developers to customize such widgets.

[HsinM]

I think if I use [custom] to develop, it is a pity that the original built-in filter can't be used.
btw, where can found st-widget manual..

[cipchk]

@HsinM See Custom Widgets demo.