Add feature to search through all open panes instead of just active pane

[tmunro]

Fixes #34: Add feature to search through all open panes instead of just the active one, a preference to control this, and the ability to invert the current preference with Shift-Enter.

@izuzak Sorry about creating a second PR, I got confused about how to rebase and screwed up the other branch.

[izuzak]

Why is this if/else block needed and you can't use this for both cases:

atom.workspace.open(filePath, searchAllPanes: searchAllPanes ).done => @moveToLine(lineNumber)

[tmunro]

I swear there was a reason, but it works and tests just fine simplified. Changed.

[izuzak]

@tmunro Thanks! I think this looks good, just had a few comments (thanks @mnquintana! 🤘).

@nathansobo -- you commented on #34 which this PR will close. Do you have some ⌛ to take a look at this as well?

[kevinsawicki]

Thanks for this, I'm going to merge it and then make a few minor changes on master and will link the commit here so you can see what I tweaked.

[kevinsawicki]

Here were the tweaks I made, really minor stuff: b44656b

Typically in packages and core we try to pass around options objects instead of boolean parameters so they are easier to understand when reading lines calling those methods such as:

@openPath(filePath, false)

versus:

@openPath(filePath, searchAllPanes: false)

[tmunro]

Good to know! Happy to help in my own small way, thanks for merging and making those changes.

[kevinsawicki]

I also tweaked the fuzzy-finder:invert-confirm keybinding to only be enabled on the mini editor inside the fuzzy finder view. Previously it was registered globally.

9b856d2