Refactoring, perf, and more

[yv989c]

• Replaces the use of static classes with interfaces via DI.
• Reimplements the Xml serializer for most simple types for speed and a dramatic reduction in memory allocations.
• Fixes minor build problems.
• Uses ObjectPool and ArrayPool to reduce pressure on the GC.
• The SELECT TOP(n) optimization can be turned off via an options parameter at configuration time.
• Avoids the logging of redundant warnings when initialized.
• Adds test for the UseSelectTopOptimization option.
• Docs reorg and edits.