Copy most dependencies source files into Eastwood source

This is an attempt to allow Eastwood to lint more projects, even if
they depend upon a version of a project incompatible with the one that
Eastwood itself depends upon.  Now they will be in separate namespaces
(as long as no linted project uses eastwood as its first namespace
segment).
Apply CMEMOIZE-13 patch to eliminate a reflection warning

in core.memoize 0.5.6
Add copy-deps-scripts directory

Contains README.md describing what dependencies have their source code
copied into Eastwood, why, and how.
Update data.priority-map to version 0.0.5

This avoids a reflection warning that appears in Eastwood output due
to reflection use in data.priority-map 0.0.2.  Even though core.cache
0.6.3 depends upon data.priority-map 0.0.2, there do not appear to be
any API changes in data.priority-map 0.0.5 that would affect how
core.cache 0.6.3 uses it.