tasks_columns order respected

[oleks-popovych]

Is your feature request related to a problem? Please describe.
I'd like to reorder columns in tasks tab not only by drag and drop, but also by simply setting the order of columns displayed in --tasks_columns flag

Describe the solution you'd like
I'd like to be able no only to exclude certain columns from the table, I'd also like to change and maintain their order by specifying one in --tasks_columns flag