beckon 0.1.5

Fixes the typing hang: the main-search file blend no longer shells out to Spotlight per keystroke (that was up to 6 seconds of main-thread stall per key); it now uses only the instant in-memory index, while the file trigger keeps the thorough Spotlight tiers. Adds fifteen System Settings panes to the command pool: type keyboard, displays, bluetooth, wifi, battery and open the pane directly.