Pasm

Some changes to pasm:
  1.  Redefine #include <filename> (where we are using <> brackets)
       to follow suite for #include <...> macro in c processors.  In other words,
       when using the <> brackets form, only files that are found in the include_dirs
       search paths will be included.
  2.  Create a command line option (-Idir) that adds to the newly defined
       include_dirs notion.  With this new capability, it is much easier to reuse code
       as well as create macro libraries that are of general use.
  3.  Add ability to process/skip /* */ style comments.
       Note only is this done for convenience, but it also makes it easier to share
       code between C and PASM files.
  4.  Add support for line continuation ala '\\'
       Not only does this allow for much longer definitions of macros, regardless
       of how small the actually become after processing, bit this also furthers the
       ability to share header files between C and PASM code.