`javaClass.classLoader` in `registerSerializersCore` causes a compiler warning

[ForNeVeR]

Every generated Kotlin class contains this snippet:

        override fun registerSerializersCore(serializers: ISerializers)  {
            val classLoader = javaClass.classLoader

javaClass.classLoader causes a Kotlin compiler warning:

The resulting type of this 'javaClass' call is Class<AvaloniaRiderProjectModel.Companion> and not Class. Please use the more clear '::class.java' syntax to avoid confusion

Let's either replace it with val classLoader = Companion::class.java.classLoader, or add @Suppress("JAVA_CLASS_ON_COMPANION") to generated files.

Currently, this issue blocks compiling projects with generated files if we have enabled warnings-as-errors in Kotlin.