feature request: add max_width for autofit

[phikuh]

Feature Request

When using the autofit method it'd be amazing if a maximum width for the columns could be specified instead of just the hardcoded 255.

# old
worksheet.autofit()

# new
worksheet.autofit(100) # max width of 100

worksheet.autofit(300) # uses 255 as max width and outputs a warning

I'm willing to submit a pull request if this feature is allowed to be implemented

[jmcnamara]

I got a similar request recently for the Rust version of this library: jmcnamara/rust_xlsxwriter#119

I handled that a bit differently by exposing the string calculation method. However your suggested approach of just setting a max width for all columns in the autofit range would probably be what 99% of users would need.

I'll put this on the short term todo list but let me look into how Excel handles auto fitting long strings first.