[KANGAROO] Auto-updates across breaking semver

[matthme]

Problem:
Currently, there is no way to have a kangaroo app auto-update across breaking semver versions. This is with the intent to prevent users to land in different DHTs in case that a breaking semver version indicates a change in dna hash(es).

Proposed Solution:
Offer an auto-update mode that allows to update across breaking semver versions and will follow the following logic:

1. Check whether it's a breaking change, if no everything fine
2. If it's a breaking change, check the holochain version of that the new app version depends on
3. a) If the holochain version is still the same, install the new happ that comes with the new app version into the conductor side-by-side to the existing happ (or uninstall the old happ) and have the UI point to the InstalledAppId of that new happ
4. b) If the holochain version is a different one, use create a new conductor and have the app use this new conductor