Allow searching a string in installed packages information

[mindrones]

Problems

• changing a setting/shortcut requires to find the installed package it's supposed to belong to (can be tricky at times, it's a bit time consuming), scroll down and find the term by eye, which is distracting;
• sometimes people assume you know where to find a certain setting and if not the case you have to search it on the web, which is time consuming and distracting.

Proposal

Allow searching terms in all of the installed packages by looking up:

• package settings' name and description (and maybe setting's allowed values?)
• package keybindings' command, selector and source
• eventually, package name and description
• eventually, package READMEs

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(on Atom 1.13.0 now)

[stevenzeck]

https://github.com/atom/settings-view/issues/284