Add create_location_io()

What’s Changed

• Add create_location_io (#15) @RosalynLP

Integrated with R studio API

Default behaviour is to search for files using R Studio API.

Can return to previous behaviour by supplying useRstudio = FALSE in any function.

Improvements to file reading

• Better rendering of filepath choices in console
• New function to match files with the same name, excluding _/-, numbers and cases: match_base_filename()
• Two functions for reading from Excel, one using readxl::read_excel() and one using openxlsx::read.xlsx().

Initial release

Initial release with basic features:

• Functions for reading Excel and csv files with alternative options supplied
• Function factory to create custom filetype loader
• Function to read all Excel sheets into a list, with alternative file options supplied