LT-14166 Alter patching system to use WIX Torch and Pyro

 * Remove all uses of WIX PatchGroup element, as the new
   WIX Pyro utility does not need PatchGroup markers
 * Configure maximum compression and use of binary deltas
 * Update code that launches patch installer
 * Adjust maximum File Id length based on Pyro.exe error
   messages
 * Some refactoring

Change-Id: I7b47c39260aae2458f74fb3f5c0c7fee8e2b1952