[Windows] Fix for failing load of UTF-16 format .kmn file (regression from default UTF-8)

[iOS] Refactor KeymanWeb wrapper

[linux] keyman config update

[Developer] Add "-add-help-link" parameter to kmcomp

Cherrypick of #1346

[Common] Refactor KMX keyboard processor out of Windows Keyman Engine and into new KPAPI-compatible model

still very rough, needs ux advice

only happens when you open download window
which assumes you are online

improve differentiating packageID and keyboardID in code

[common] Working options model. Introduces some gunk around state and options which should be reviewed with TSE

[common] Add test framework and tests for keyboard options (failing right now because no implementation)