Magneto.1.0.0-rc-5

• Various refactoring
• Renames (like dropping superfluous Async suffixes)
• Updates to documentation and samples, greater test coverage
• Enable injecting cache key creator via static CachedQuery class
• Add ValueTuple context support for net461
• Make CacheEntry class a sealed immutable value-like type
• Make CacheOption a required parameter so that it is clear that a cached query is being used
• Ensure Magneto throws meaningful exception when context is not registered