Cleanup annotation/symbol processing

...lin/de/justjanne/libquassel/generator/InvokerProcessor.kt

.../libquassel/generator/annotation/RpcFunctionAnnotation.kt

...ne/libquassel/generator/annotation/RpcObjectAnnotation.kt

...justjanne/libquassel/generator/kotlinmodel/KotlinModel.kt

...ne/libquassel/generator/kotlinmodel/KotlinModelVisitor.kt

...in/de/justjanne/libquassel/generator/rpcmodel/RpcModel.kt

...ustjanne/libquassel/generator/rpcmodel/RpcModelVisitor.kt

...stjanne/libquassel/generator/util/kotlinpoet/ArgString.kt

.../libquassel/generator/util/kotlinpoet/WhenBlockBuilder.kt

...stjanne/libquassel/generator/util/kotlinpoet/buildWhen.kt

...tjanne/libquassel/generator/util/kotlinpoet/withIndent.kt

...de/justjanne/libquassel/generator/util/ksp/asClassName.kt

...tlin/de/justjanne/libquassel/generator/util/ksp/asType.kt

.../de/justjanne/libquassel/generator/util/ksp/asTypeName.kt

...e/libquassel/generator/util/ksp/findAnnotationWithType.kt

...ibquassel/generator/util/ksp/getClassDeclarationByName.kt

...n/de/justjanne/libquassel/generator/util/ksp/getMember.kt

.../justjanne/libquassel/generator/util/ksp/hasAnnotation.kt

...tlin/de/justjanne/libquassel/generator/util/ksp/toEnum.kt

...anne/libquassel/generator/visitors/KSDeclarationParser.kt