C's argv now wrapped as a global argv in Lily.

This is a step toward wrapping it under a package. Used blastmaster to ensure
that this did not introduce a memory leak.

Also, added lily_pkg_sys which will eventually add argv as part of a new sys
package. But, for now, it just adds argv to the list of globals.
lily_pkg_*.* -> lily_cls_*.* except for lily_pkg_sys.*

This makes it clear that lily_cls_list.* implement the list class, instead of
providing a list package. This is important now that there is a sys package of
which there is no class.