fix(windows): Settings refresh management

Fixes #4011.
Fixes #4039.
Fixes #4121.

This change completes the immediate-change model for Keyman
Configuration, by refactoring the refresh of settings out of the render
phase and more appropriately splitting applying and refreshing. It adds
a new message flag for wm_keyman_refresh, KR_SETTINGS_CHANGED, which
uses a random token approach broadcast to all applications on the
desktop to ensure that the refresh is received and multiple
notifications for the same event can be appropriately coalesced.

Most of the files touched are stripping out the refresh flags from the
render phase.

There is one small bug resolved at the same time with the options
properties, which were not reset to default if they had been deleted
from the registry prior to a refresh (see utilkeymanoption.pas).