#186 - Part 1 - Initial plugin installer implementation

[bryphe]

This is an initial implementation of a bundled plugin manager (well, installer / uninstaller).

It turns out yarn can handle both npm and direct-from-git installs, and it has a standalone version. This is similiar to what hyper does to facilitate plugin installs.

This adds an interface like Oni.plugins.installer.install("tpope/vim-surround"), which will download and install that to the user's plugin folder.

A few things coming in next:

• Notification support - show a notification while the install is in progress.
• Ability to add plugins via a config option (plugins: ["tpope/vim-surround", "oni-plugin-tslint"])
• Ability to disable plugins in the sidebar pane
• Ability to open plugins folder from the sidebar pane
• Additional metrics / info available in sidebar pane (ie, activation time, errors)

[codecov]

Codecov Report

Merging #1883 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1883      +/-   ##
==========================================
- Coverage   30.18%   30.17%   -0.02%     
==========================================
  Files         238      238              
  Lines        9021     9024       +3     
  Branches     1351     1351              
==========================================
  Hits         2723     2723              
- Misses       5605     5608       +3     
  Partials      693      693

Impacted Files	Coverage Δ
...rowser/src/Services/Explorer/ExplorerFileSystem.ts	64.28% <0%> (-17.54%)	⬇️

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