change(web): drops old IE-related handling code

auto: increment master version to 16.0.19

chore(core): move common/core/desktop/ to core/ 🍏

auto: increment master version to 16.0.18

fix(web): fixes doc-keyboard generation

chore(web): updates error-reporting lib uploader

auto: increment master version to 16.0.17

chore(linux): Update Debian changelog 🍒 🐧

fix(ios): overzealous error about missing banner image

fix(web): key tip constraint logic requires .bottom CSS 

chore(web): Merge remote-tracking branch 'origin/fix/web/help-doc-keyboard' into fix/web/help-doc-keyboard

auto: increment master version to 16.0.16

chore: add trigger definitions for stable-15.0 and fixup force param for increment-version.sh 🍒

fix(web): crash on custom modifier keys 🍒

auto: increment master version to 16.0.15

Co-authored-by: Marc Durdin <marc@durdin.net>

chore(web): add 'index.html' to parent links in test pages

We need a '../index.html' link rather than '../' on the three
second-level KeymanWeb test pages, in order to get to the index page for
artifacts when the test pages are hosted on build.palaso.org --
otherwise TeamCity returns a 404. (This is probably also good for
file-system-based navigation.)

We don't need the same reference on other directories, just for the
top-level index.html.

Identified at https://github.com/keymanapp/keyman/pull/6557#issuecomment-1157526326

Fixes #6788.
Fixes KEYMAN-WEB-22.
Fixes KEYMAN-DEVELOPER-BQ.
Fixes KEYMAN-ANDROID-160.

Fixes a crash introduced in #6473 which was trying to prevent modifier
keys from triggering "fat finger" alternate lookups, due to incomplete
nullish coalescing.

Related to this, from what I can see, a secondary side-effect of the fix
in #6473 was that some key events may have never had their ruleBehaviors
finalized if they matched the `isOnlyLayerSwitchKey` heuristic, leading
to potential issues with edge case 'deadkey+layer switch' keys or keys
that set store values, for example. So this fix also makes the
`isOnlyLayerSwitchKey` test more targeted.

Identified this when adding a Caps Lock layer to sil_euro_latin and
testing the layer switching. At time of fix, the error had been raised
in KeymanWeb, Keyman Developer and Keyman for Android, but not yet
Keyman for iPhone and iPad.