Template functionality: replace system and application anywhere

[equwal]

Any .*system.*.asd or .*.application.*.lisp file will be replaced with the name. So application-tests.lisp becomes projectname-tests.lisp. Does not change the default template functionality at all.

Tests:

(template-pathname->output-name "application-tests.lisp" "asdf")
 ;; => #P"asdf-tests.lisp"

(template-pathname->output-name "system-tests.asd" "asdf")
 ;; => #P"asdf-tests.asd"

Resolves #21