* Simplify the build dependency / child tree
* Split building and testing tooling so we don't rebuild components
* Fixup expected outputs to avoid repeated builds of components
* Remove unused dependency references
* Move test.sh targets into build.sh, so that testing doesn't lose
dependency tracking and cause unnecessary rebuilds. (Note that I have
not yet deleted test.sh.)
* Make predictive-text a direct child of engine, so that we don't build
it twice (or even more times)
Test-bot: skip
sentry-manager is used by Keyman Engine for Android and Keyman Engine
for iOS, but not directly by KeymanWeb, nor does it have any
dependencies on /web. So it does not make sense to keep it under /web.
es-bundling is used by sentry-manager and potentially other /common/web
tools in the future, so moving it under /common/tools makes it more
consistent in the future.
This is part of simplifying the web source tree; these changes do not
make significant build performance differences at this time.
Test-bot: skip
