Fixes #5188.

Fixes #5166.

This introduces versioned management of sentry.dll for Keyman for
Windows, Keyman Engine and Keyman Developer. As sentry.dll's ABI is not
backwardly compatible, we have to maintain independent copies of each
DLL for each app.

sentry.dll (or sentry.x64.dll for x64 apps) will be found in the
sentry-0.4.9 folder relative to the running process, except when running
from within the keyman repo tree (based on presence of KEYMAN_ROOT env
var). In those cases, the windows/src/ext/sentry sentry.dll will be
used, allowing us to test new debug time sentry DLLs easily.

A little bit of cleanup and consolidation was also done in the
KeymanPaths.pas unit.

change(ios): minimum iOS version -> 12.1

chore(ios): dependencies - update sentry-cocoa to 6.2.1

auto: increment master version to 15.0.57

change(ios): help always offline

feat(common): offline help css

fix(ios): link, but NOT embed KeymanEngine.xcframework in app exs

auto: increment master version to 15.0.56

fix(ios): artifact upload preparation

auto: increment master version to 15.0.55

fix(ios): re-enable SKIP_INSTALL

chore(linux): Update changelogs 🍒

docs(linux): Update readme

chore(web): Add CI script to kill BrowserStack tunnel

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

chore(windows): Update Sentry to 0.4.9

auto: increment master version to 15.0.54

- remove mention of `scim_kmfl_imengine` which we recently removed
- reformat list of required packages

(cherry picked from commit d2532fa3)