Relates to #3621.

Adds basic support for `begin newContext`.

Relates to #3621.

This adds basic compiler support for the `begin newContext` and
`begin postKeystroke` statements, along with the corresponding `gn` and
`gpk` entry points in the compiled JavaScript keyboard.

TODO: `readonly` semantics, usage constraints, `&layerChanged`.

Relates to #3621.

Initial draft of keyboard to test start-of-sentence detection.

auto: increment master version to 15.0.155

chore(linux): Run ibus-keyman tests as part of the build 🎫

Part of #5613.

Array has to be NULL terminated.

Part of #5613.

chore(linux): Remove unused test methods 🎫

feat(mac): i18n, support localization of Keyman for Mac

fix(web): inline osk keytip position

fix(web): simplify hide transition

auto: increment master version to 15.0.154

fix(web): resolve unhandled exception in promise

auto: increment master version to 15.0.153

This change removes the pre-edit related test methods since we
don't use the pre-edit option.

fix(common/core):  Update decxstr to check all characters while decrementing

auto: increment master version to 15.0.152

fix(developer): move web osk beneath text area

fix(mac): use xcframework to support m1

Fixes #5935.

Takes parent element's position into account when calculating keytip
location.

fix(android/engine): Support for U_xxxx_yyyy subkeys

Fixes #5926.

This gives space for the popups to appear, even if they are large.

fix(developer): use correct tike icon

auto: increment master version to 15.0.151

fix(web): remove canvas use for iOS compatibility

auto: increment master version to 15.0.150