EIEIO: Simplify help hyperlinks; Try and reduce hardcoding in .elc

EIEIO: Simplify help hyperlinks; Try and reduce hardcoding in .elc

* lisp/emacs-lisp/cl-generic.el (cl--generic-search-method): Fix regexp.

* lisp/emacs-lisp/eieio-core.el (eieio--check-type): Remove.
Use cl-check-type everywhere instead.
(eieio-class-object): Remove, use find-class instead when needed.
(class-p): Don't inline.
(eieio-object-p): Check more thoroughly, so we don't treat cl-structs,
such as eieio classes, as objects.  Don't inline.
(object-p): Mark as obsolete.
(eieio-defclass-autoload, eieio-defclass-internal, eieio-oref)
(eieio--generic-tagcode): Avoid `class-p'.
(eieio-make-class-predicate, eieio-make-child-predicate): New functions.
(eieio-defclass-internal): Use current-load-list rather than
`class-location'.

* lisp/emacs-lisp/eieio-opt.el (eieio-help-class, eieio-help-constructor):
Use find-lisp-object-file-name, help-fns-short-filename and new calling
convention for eieio-class-def.
(eieio-build-class-list): Remove function, unused.
(eieio-method-def): Remove button type, unused.
(eieio-class-def): Inherit from help-function-def.
(eieio--defclass-regexp): New constant.
(find-function-regexp-alist): Use it.
(eieio--specializers-apply-to-class-p): Handle eieio--static as well.
(eieio-help-find-method-definition, eieio-help-find-class-definition):
Remove functions.

* lisp/emacs-lisp/eieio.el (defclass): Use new eieio-make-class-predicate
and eieio-make-child-predicate.
(eieio-class-parents): Use eieio--class-object.
(slot-boundp, find-class, eieio-override-prin1): Avoid class-p.
(slot-exists-p): Use find-class.

* test/automated/eieio-tests.el (eieio-test-23-inheritance-check): Simplify.