Collapsible columns and multi-column.

[bav2653]

Hello.

1. Give us the ability to add collapsible columns. It might be possible to implement this with the "Shift" modifier, meaning that a left-click on the button adds a regular column, while Shift+left click adds a collapsible column.
   You can insert this code into Obsidian to see how he look.

> [!info] AAA
>  123

Collapsible column:

> [!info]- AAA
> 123 

2. Please add a button for a multi-column.

> [!multi-column]- AAA
>> [!danger]- BBB
>> 123 
> 
>> [!quote]- CCC
>> 123 
>
>> [!danger] DDD
>> 123 
> 
>> [!quote] EEE
>> 123