Let arguments in the arguments array

We transfer them normally to the frame to allow specialization on their type.

Signed-off-by: Stefan Marr <git@stefan-marr.de>

Conflicts:
	src/som/compiler/MethodGenerationContext.java
	src/som/compiler/Parser.java
	src/som/interpreter/nodes/ArgumentInitializationNode.java
	src/som/interpreter/nodes/ArgumentReadNode.java
	src/som/interpreter/nodes/ContextualNode.java
	src/som/interpreter/nodes/UninitializedVariableNode.java
Clean up ContextualNode, remove dead code

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Add temporary dummy parent to enable replacement

not sure why that's not needed in the master branch. strange.

Signed-off-by: Stefan Marr <git@stefan-marr.de>