QuickOpen: Ctrl-P / QuickOpen menu only works with git

[bryphe]

Right now, the QuickOpen menu only works with git. The code for finding files looks like this:

oni/browser/src/Services/QuickOpen.ts

    const trackedFiles = execSync("git ls-files").toString("utf8").split("\n")
    const untrackedFiles = execSync("git ls-files --others --exclude-standard").toString("utf8").split("\n")

It would be helpful to have, at the very least, a fallback strategy to use a node module for recursively traversing the file structure. In addition, having the command line be a user-configurable option would be really helpful - so people can use the preferred search tool of their choice (ag, grep, etc).

[bryphe]

Fixed by #97