Easier lookup

[KennethSundqvist]

The focus of these changes are to make looking things up easier and faster.

To summarise the changes:

• Open/Close the CanIUse panel with the "Ctrl-Alt-U" keyboard shortcut.
• Filter on the selected text if any and focus the filter field when opening the panel.
• Updated design of the filter and feature list column.
• Fix a bug where data was loaded each time the panel was opened, causing duplicate entries in the feature list.
• Hide category titles when there are no matches in the category.
• Keyboard navigation for filter and feature list; Tab/Shift-tab or Up/Down or J/K.
• Trim the filter value from whitespace at its beginning and end.

[cfjedimaster]

My god - an amazing amount of work. EvilOatmeal (great nic btw) - thank you!

[cfjedimaster]

Oh oh - I'm seeing some 'bleeding' of the drop down. See:

https://www.evernote.com/shard/s3/sh/55abe7e0-7987-4990-82cf-af5b1c6a1740/5cbbb426869d7a7727191aaa84ffcd8c

[cfjedimaster]

I should note that when I resized the bottom panel it went away, so it may be an issue just at smaller sizes.

[KennethSundqvist]

I cannot reproduce the 'bleeding' bug. Which version of Brackets are you using? I am using Sprint 25 Official OS X package.

[cfjedimaster]

So am I. I had greatly increased the font size for a preso. Maybe that was part of it. I can't recreate it now so I think you can ignore.