Performance Improvements and Bugfixes

This update improves performance of Rumor significantly. Many bugs have also been fixed.

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Changed

• Rumor.CallBinding no longer calls DynamicInvoke and is much faster
• Tokenize step of compilation is much faster

Fixed

• Fix Rumor.Choosing throwing an error if Rumor has not been started
• Fix scope not being initialized when passed as null when constructing Rumor
• Fix Add statements behaving like Say statements
• Fix null pointer exception in Equals expression
• Fix incorrect equality checking
• Fix improper deserialization of values caused by wrapper types (Json.NET will
  wrap object values in its own type, JValue, which causes logic to fail)
• Rumor no longer clears the scope when starting
• Null ObjectValues are now treated the same as an uninitialized (null)
  variable