Removed redundant scala files

Many bugs fixed with tests not being run by maven
Modified KotlinAST to fake immutability, I am pretty sure you can insert new elements into KtElements however this would change the hashCode of the AST and result in problems.
Added more constructors for kotlin classes to support variety in used mutators

…ismatch)

…tlin.test again instead of using jupyter)

# Conflicts:
#	stryker4jvm-mutator-kotlin/src/test/kotlin/stryker4jvm/mutator/kotlin/InstrumenterTest.kt

# Conflicts:
#	stryker4jvm-mutator-kotlin/src/main/kotlin/stryker4jvm/mutator/kotlin/KotlinInstrumenter.kt
#	stryker4jvm-mutator-kotlin/src/main/kotlin/stryker4jvm/mutator/kotlin/KotlinParser.kt

Circumvent is made because the current way of passing down a config makes it really hard to test individual components as they now all require a configuration. Would be better if they were passed to the constructor once (of the class that extends LanguageMutator) such that individual components do not depend on this configuration anymore (config can be used once and then discarded as classes should be initialized based on config)
Fixed issue with stryker4jvm-core exception having multiple constructors

…ST but instead modifying the original.

Note that it still modifies the original but that we wrap the resulting tree into a new AST