v4.2.0 Feature and bug-fix release

• feat: #133 Optimize Switch Expression

• feat: #393 Support ToCSharpString of the block in the ternary expression

• feat: #396 Optimize conditional expressions with the DefaultExpression left or right operand the same way as ConstantExpression

• fix: #390 System.AccessViolationException when mapping using Mapster

• fix: #391 ToCSharpString outputs ? for Nullable which does not produce the compile-able code

• fix: #392 ToExpressionString wrongly declares Label instead of LabelTarget array

• fix: #394 Calling a user defined == operator runs into a CLR invalid program exception

• fix: #397 Fix and optimize the Switch support

• fix: #399 Coalesce nullable with 0 is not working

• fix: #400 Fix the direct assignment of Try to Member expression because indirect assignment through tmp var works

• fix: #401 Invoke inlining is not working with collections in AutoMapper tests

• fix: #404 An expression with a single parameter concatenated to a string causes 'Exception has been thrown by the target of an invocation' during delegate invocation

• fix: #405 NullReferenceException with V4.X when using long?[]

• fix: #406 NullReferenceException with V4.X

• fix: #407 NullReferenceException when setting the Enum field

• fix: #408 Dictionary mapping failing when the InvocationExpression inlining is involved