Expand preprocessor to handle macros which open or close scope.

Expand preprocessor to handle macros which open or close scope.

* semantic/lex-spp.el (semantic-c-end-of-macro): Declare.
(semantic-lex-spp-token-macro-to-macro-stream): Deal with macros which
open/close a scope.  For this, leave an overlay if we encounter a
single open paren and return a semantic-list in the lexer.  When this
list gets expanded, retrieve the old position from the overlay.  See
the comments in the function for further details.
(semantic-lex-spp-find-closing-macro): New function to find the next
macro which closes scope (i.e., has a closing paren).
(semantic-lex-spp-replace-or-symbol-or-keyword): Go to end of closing
macro if necessary.
(semantic-lex-spp-paren-or-list): New lexer to specially deal with
parens in macro definitions.

* bovine/c.el (semantic-cpp-lexer): Use new
`semantic-lex-spp-paren-or-list'.

* tests/cedet/semantic/test/manual/cedet/testsppreplace.c:
* tests/cedet/semantic/test/manual/cedet/testsppreplaced.c: Add tests for the
above.