Optimization, fixes & new distributions

Added

• DropSharedGenerator() and DropSharedFilter() methods. They allow to drop a current generator/filter and create a new one on a next call of sharedGenerator/sharedFilter property.
• Editable Weighted generator providers.
• Gamma distribution.
• Negative Binomial distribution.
• Weighted distribution editor.

Changed

• Marsaglia distribution is renamed to Normal distribution.
• Binomial distribution is rewritten and became much faster.
• Poisson distribution is rewritten to avoid infinite loops.
• Inlining of some methods is changed for performance reasons and more compact assemblies.

Removed

• Box-Muller distribution. If you use it, start to use Normal distribution.

Fixed

• NormalGenerator didn't use its parameters.