#2 Remote State and move its contents to Interpreter
#2 Refactor interpreter after State and Interpreter combine
#2 Move execution of words from switchi block to WordSet classes
#2 Add initial WordSet classes
#2 Make f4v compile again
#2 Do some organization
#2 Introduce CompiledWord for parameterized Words that are compiled into
a Defined Word
#2 Add placeholders for all Words defined in all WordSets
#2 Implement some flow control words according to new model
#2 Rest of the flow control words
#2 Fix HeapWordSet
#2 Fix ArithmeticWordSet
#2 Fix InterpreterWordSet
#2 Fix MiscWordSet
#2 FixSQLWordSet
#Fix StackWordSet
#2 Fix StringWordSet
#2 Fix VaadinWordSet partially

Also changed the general WordSet structure, as the old one didn't play
nice with Eclipses content assist.
#2 Fix reset of VaadinWordSet
#2 Modify Interpreter towards the new model