Allow configuring the width of board columns

When having a board that shows multiple columns, each column resizes to fit all columns to the window size. When having multiple columns, it starts to squeeze the columns to the point where it is not possible to see what each column content or title is.

The suggestion is to have a minimum width for each column and if the columns would not fit the screen, create a scrollable space so we can scroll horizontally and navigate through all the columns.