fn to avoid remotes::install_git() error on network drives

[slager]

Description

Drop-in replacement for remotes::install_git(), to avoid recurring issue of that function giving this error when used on network drives:

> remotes::install_git('/networks/path/repo.git')
Error: Failed to install 'unknown package' from Git:
  Error in 'git2r_remote_ls': unsupported URL protocol

Related Issues

Provide links to any related GitHub issues.

Checklist

• This PR includes unit tests
• This PR establishes a new function or updates parameters in an existing function
  • The roxygen skeleton for this function has been updated using devtools::document
• I have updated NEWS.md to describe the proposed changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.41%. Comparing base (49fac3a) to head (96faef8).
⚠️ Report is 8 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #315      +/-   ##
===========================================
+ Coverage    85.33%   85.41%   +0.07%     
===========================================
  Files            9       10       +1     
  Lines          375      377       +2     
===========================================
+ Hits           320      322       +2     
  Misses          55       55              

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[kelliemac]

tested and works on my mac. thanks dave!

[mayerbry]

per our discussion: create two arguments. first argument is required to be a path input and named accordingly. keep ... for second argument and reference remotes::install_git help. Corresponds to any input except url which will be hard assigned via the processed version of the path input.
Functionality of function should be the same effectively, but should make the help documentation cleaner as it relates to first argument being the filepath.

very crude pseudo code

function (new_path_arg, ...) 
{
 [directory management, tests]
 remotes::install_git(url = basename(new_path_arg), ...)
 [directory management]
}