2.0.0 Release: support Scala, initial support for Spock parameterized template, new settings UI

[yaronyam]

Main features added in this PR - v2.0.0:

• Generate test code in Scala with Spec2 test framework
• Generate Spock Parameterized tests. beta feature. multi parameter sets not supported yet Test Scala classes
• Properly Assert methods returning Java or Scala futures
• Test params generator: support Scala Enumeration and sealed objects enumerations
• New Settings UI to control some aspects of the test generation behavior
• In Settings UI - an option to skip test generation for inherited methods (requested by subodh on Sep 16 '17 and by manishkumawat_900 on July 16 '18)
• bugfix: inherited methods with generic params don't get substituted in generated tests (reported by Avichai S. on April 30 '18)

[coveralls]

Coverage decreased (-25.8%) to 62.657% when pulling b5554367b2469eeb55b9f2472d5fe03a39e92a74 on 2.0.0 into c82abcf2ed0cdd66ac2220317bcee0fd8726ae5e on master.