karma-chrome-launcher doesn't support newer chrome yet

Use code splitting instead

also provies a function for css content icons (a bit hacky as it uses masks)

This uses sentry internally, but only sends things to the server when
configured that way.

So that packages depending on it install it as well

node-resolve wasn't limited to the local node_modules and picked up the
dependency from another package on my machine.

When specifying a package for code splitting, rollup requires the
packages to have a valid entry point for some reason.

Add an empty one.