Display shortcuts for active app

[maltsev]

In most cases, we're interested only in shortcuts related to a currently active app. Alfred allows to get an active app name, so we can filter the results.

This can be achieved either with a hotkey trigger with Focused App Variable enabled or using the following Applescript:

tell application "System Events" to return name of first process whose frontmost is true

Though, these solutions won't give you a name or a URL of an active browser tab.

As with #12 we can make a separate trigger for it.

[mutdmour]

that would be a nice feature. I might take it on if I get the time soon.