Modernize Package and Add New Vignettes

[a-hurst]

This PR contains a number of maintenance updates for eyelinker as well as two vignettes.

Apart from various fixes to bring the package conventions in line with current R practices, the main changes are:

• Makes the tidyverse-style function aliases (read_asc, which_interval, %within%) the preferred method in the documentation and examples
• Fixed all remaining NOTEs in from devtools::check()
• Added reverse dependency checks for the package
• Switched to double-quotes consistently throughout, as is recommended
• Added a vignette showing how to batch-import data
• Added a vignette with an example of how to window and epoch raw sample data

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a641efa) to head (77d49bd).
⚠️ Report is 5 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff            @@
##            master        #7   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            2         2           
  Lines          271       271           
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  Hits           271       271           

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