Fixes #2450. When Keyman serialized input, it would cause the touch keyboard to cancel
because the touch keyboard thought the received event meant the user was touching the
physical keyboard. This resolves that problem, using a watch timer to check the visibility
of the touch input panel.

fix(linux) Remove cosmic and disco releases

19.04 Disco is EOL Jan 23, 2020 so also remove it

18.10 was end-of-life July 18, 2019 and launchpad is rejecting any further package updates for that version.

fix(web): default BKSP output targeting

fix(ios):  Fixes margins on keyboard in iOS 9/10

fix(web): Suggestion reordering for RTL languages

fix(common): RTL model specification

feat(ios):  Deeplink into Keyman settings for system keyboard setup

fix(ios): Now (eventually) uses sys pref for kbd clicks

[Web] Fix K_TAB from external keyboard

fix(android): Fix cancelling ConfirmDialogFragment

fix(linux): Update launchpad PPA by tier

fix(web): dev_resource compile fix

Update launchpad.sh so that `${tier}` corresponds to the ppa link:
`stable` --> ppa:keymanapp/keyman
others --> ppa:keymanapp/keyman-daily
 ppa depends on the `${tier}`.