All the code working around issues in Emacs 24 and Emacs 25 has been
removed at this point! (or at least, as much of it as I could find)

I've tested against Emacs 28 and it's working fine. I need many more
automated tests to ensure that behaviour does not break across
multiple Emacs versions / operating systems, but that is a topic for
another day.

This commit bumps the version of `pdf-tools` from `1.0.0snapshot` to
`1.0.0`. I do not expect this to have any real change either on Melpa
Stable or Non-GNU Elpa, since they already parse the version as 1.0.0.

I am not creating a tag at the moment. I will do some more cleanup
work and directly create a `1.1.0` post those changes.

Closes: #26

* Cask (depends-on):

* lisp/pdf-tools.el: Add let-alist as requirement.

* lisp/pdf-occur.el (pdf-occur-add-matches, pdf-occur-start-search): Use new interface.

* lisp/pdf-isearch.el (pdf-isearch-search-page): Use new interface.

* lisp/pdf-info.el (pdf-info-query--transform-action,
  pdf-info-query--transform-response): Prefer alists over trees or
  positional lists, where appropriate.

  (pdf-info-search-string,pdf-info-search-regexp,pdf-info-pagelinks
  pdf-info-charlayout,pdf-info-pagelinks, pdf-info-outline,
  pdf-info-synctex-forward-search, pdf-info-synctex-backward-search):
  Updated documentation.

* test/pdf-info.ert: Require let-alist, use new interface.

* Makefile (bytecompile, test): Use cask.

* Cask (depends-on): Add let-alist.

* lisp/pdf-outline.el: Use new interface.

* lisp/pdf-links.el: Use new interface.

* lisp/pdf-cache.el: Use new interface.

* lisp/pdf-sync.el: Use new interface.

* test/run-tests.el (file-name-directory): Run tests on the installed package.

* server/configure.ac: Get the version from the toplevel Makefile.

* README.org: Adjust installation instructions.

* Makefile: Don't require cask anymore.

* Cask: Adjust dependencies.

* .gitignore: Add package files.