Get rid from CompoundName in SimpleReference

[someilay]

I suggest to remove CompoundName from SimpleReference and replace it by String:

...
// Structure
public CompoundName compoundName; --> public String name;
...

It is more convenient because any compound name can be decomposited to SimpleReference and FieldAccess. Moreover, it helps to avoid ambiguity of parsing.

Example:

a.b.c()

Now we can build AST for this code in two ways:

1. MethodInvocation[qualifier = SimpleReference[compoundName="a.b"], name = "c"]
2. MethodInvocation[qualifier = FieldAccess[identifier = "b", expression = SimpleReference[compoundName="a"]], name="c"]

Second way it is more natural and close to grammatics. Also it seems to be more general.