1.0.0-beta.15

• Updated Statiq Framework to version 1.0.0-beta.30.
• Breaking change: Refactored the exiting bootstrapper process extensions to use the ProcessTiming enum.
• Fixed a regression with the preview command and file watching that was execution more than once on file changes.
• Added a WatchPaths setting that adds additional folders to watch in preview mode (#930).
• Added additional bootstrapper extensions to specify whether a process should launch when previewing, when not previewing, or always (#931).
• Added a flag for "concurrent" processes that run in the background but wait for exit before the next process timing phase (#931).
• Added a ProcessTiming.Initialization setting to start a process before all others (#932).