Recommendations Tab: GC

[aikar]

Stub in the foundation for a Recommendations tab that provides human readable suggestions.

First task: Detect GC flags using standard Java GC and recommend my GC flags
Also detect CMS and print different wording that while CMS is overall ok, it has some flaws and still recommended to use my flags.

Detect if any old gen are occurring even with my flags ,and suggest getting more memory.