(editorconfig-indentation-alist): Sync with upstream

(editorconfig-indentation-alist): Sync with upstream

The upstream version `editorconfig-indentation-alist` is a lot
more complete than what we got from the
copyright-covered commits.  The changes come from contributors
who (may) have not signed paperwork.  I have not tracked all of
the corresponding commits (there are many) but from what I can
tell, most of those are the sole (and "trivial") contribution
of its author, and in any case there is very little creativity
involved since it just lists the variables used by the
corresponding mode, so I believe it's perfectly OK to include
those here.  Many of them would be covered by our default
heuristic (which looks for vars of the form like `<mode>-basic-offset`),
but it's preferable to reduce changes with upstream.

* lisp/editorconfig.el (editorconfig-indentation-alist):
Synchronize with upstream.  Remove obsolete `sh-indentation`.
(editorconfig--get-indentation-web-mode): Update based on upstream
changes to `editorconfig-indentation-alist`.