Convert Lucene volatile long/double values to Atomic counterparts, #1063

[paulirwin]

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Convert long/double values that are volatile in Lucene (but can't be in .NET) to AtomicInt64 or (new) AtomicDouble.

Fixes #1063

Description

Since we can't use volatile on 64-bit values in .NET, this doesn't work for long or double. This PR changes volatile long fields to be AtomicInt64 from J2N, as well as introduces a new internal AtomicDouble type in Support for those values, using bit conversion to/from long internally so that we can use Interlocked on it.

[NightOwl888]

I found a couple more minor issues with parameter/variable naming and the fact that TryFormat wasn't overridden and pushed a couple of commits. I have opened NightOwl888/J2N#125 and NightOwl888/J2N#126 to address some of the issues that were discovered here in J2N.