Include filter/find shortcuts (⌘F and/or ⇧⌘F)

Improvement suggestion

I think it'd be incredibly useful to have ⌘F and/or ⇧⌘F keyboard shortcuts for setting the insertion point/cursor within the various filter/find search fields, e.g.:

- (IBAction)performFindPanelAction:(id)sender {
    [self.window makeFirstResponder:searchTextField];
}

Potential implementation

Bookmarks View

⌘F could position cursor in search field to quickly filter bookmarks within Bookmarks View

File Status View

⌘F could position cursor in search field to quickly filter files within File Status View

Log View

⌘F could perhaps switch the view over to the Search View since there is no search field in Log View (also, being able to use ⌘J as a shortcut to "Jump to" commit hash/branch within the Log View would be handy)

Search View

⌘F could position cursor in search field. It might be good to assign ⇧⌘F to be able to accomplish the same behavior when done from any of the 3 main views as well (emulating Xcode's shortcut for "Find in Workspace")