Feature: Support XLSM, XLSB & Replace excel engine with faster calamine

[yeungadrian]

Background

Python-Calamine is a rust based excel reader(https://pypi.org/project/python-calamine/) which supports .xls, .xlsx, .xlsm, .xlsb (also .ods)
Calamine should provide a "free" bump in performance.
Using calamine & tabulate over pandas should also result in fewer dependencies
Should allow a cleaner solution to #52 around filtering empty rows & columns with a small additional change

Changes

• Remove pandas + openpyxl & xlrd -> calamine & tabulate instead
• Support xlsm & xlsb

Open questions

• Argument against could be that python-calamine is not as well known
• Could just use tabulate, instead of additional html to str conversion
• Future pr could add argument of skip_empty_area to cli / argument

[hewliyang]

As of Jan 19, calamine is now supported as an engine in pandas - I don't see any reason not to just have one processor for .xls, .xlsx, .xlsm, .xlsb , .ods anymore

@afourney doesn't seem to be in favor of removing sparsity by default, so would have to give some flags as in #52.