"Quick" Append Events. Closes GH-3138

[jeremydmiller]

Docs on the quick append option

Few more tests for metadata on the new quick append mode.

More tests on the quick append

First end to end runs of the quick append mechanism

Roughed in QuickEventAppender and configuration logic for switching append modes

First successful pass at code generation for the quick append function

Lot more preparatory work for "quick append". Put back the old AppendEventFunction

Refactored on the code generation for append event operations in preparation for the quick append

Roughed in IncrementStreamVersionBy*** for later