Highball 0.8.3

Three fixes from a full run as a brand-new user on 0.8.2.

Fixed

The library keeps up with installs. A game installed in Steam after Highball started did not appear until you relaunched the app. It shows up now.
Steam's first start recovers by itself. On some first runs Steam's bootstrapper finishes and the client then hangs with only its small update box on screen. Highball now notices and restarts it once, and says so.
Mac apps behave (issue #53). A Mac app for a game no longer brings the Highball window in front of the game, and opening several no longer opens several Highball windows. The Steam and other launcher tiles now offer "Make a Mac app…" too (right-click).

A play link launches the game in seconds with one Highball window, Highball staying in the background.
169 tests.