templates – add default-skeleton keyword

[dkochmanski]

I've noticed, that there is no way to get rid of the default skeleton with files README.txt, {name}.asd, {name}.lisp and package.lisp.

This will be useful, because thanks to that user will be able to create his own custom templates from scratch (indirectly fixes #2).

[dkochmanski]

(and it extracts default-skeleton implementation from the quickproject.lisp into default-template.lisp)

[dkochmanski]

the last commits add possibility to rewrite file names (with the very same rules used in the files)

[xach]

@inaimathi Does your work obsolete this, or is it complementary?

[inaimathi]

It's a conflicting change. Looks like this is an approach that keeps code-defined generators for the README.txt, {project}.asd and {project}.lisp file. It looks like there are changes that let you override these with a template you can write.

I'm not entirely clear on how this lets you have a file named {project}.asd and {project}.lisp (short of fiddling with your template per generated project), and I'm not sure I like having the default templates defined in code using format (instead of the way users would have to define theirs), but it seems otherwise equivalent.