[PATCH v3 2/2] D: Move classification of symbols from the grammar to the lexer

[Iain Buclaw]

This patch rewrites the lexer to be just like C++'s, where it will
attempt to classify and reduce any alternating '.' and symbol-like
tokens.

There is a little added complexity as existing D compilers will only
write the full module name to debug.  For instance, given
'package.and.another.foo', the first three parts will return as
unknown/non-existent symbols.   While it would be nice to fix this in
my compiler, there does not seem to be a nice way to chain package and
module names together that is understood by GDB (I think language_go
has a similar problem to this).

However, now I'm happy.  As I can finally begin to start supporting
and implementing exp.property style syntax in the grammar without
running into shift reduce conflicts (starting with .sizeof and .typeof
:-)

Regards
Iain.
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