* codegen-kotlin: Don't generate equals/hashCode/toString/copy/:Serializable for abstract classes
* Polish KotlinCodeGeneratorTest
- use `assertContains()` instead of `assertThat().contains()`
- remove redundant `trimIndent()` and `trimMargin()` calls
- rename `javaCode` to `kotlinCode`
* Overhaul KotlinCodeGeneratorTest
- introduce classes KotlinSourceCode and KotlinSourceCodeAssert
- change assertions to use KotlinSourceCodeAssert via `assertThat(kotlinCode)`
- use explicit trimIndent() and trimMargin() for multiline string literals
- IntelliJ editor desperately wants to insert trimIndent()
- can be used by kotlinc and ktfmt
- format code in the exact way it falls out of the IntelliJ editor
(successfully destroyed by ktfmt)
translatenix
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