Versions: Lit-Element to 2.4.0 and Lit-HTML to 1.3.0

Use "language" instead of "lang" because "lang" seems to be handled specially in html elements (dbp/apps/library#77)

This fixes a typescript problem and allows us to enable type checking
in the typescript-example package (by removing the ts-nocheck comment)

Implement "set-property" handling in dbp-provider and use it in dbp-language-select (dbp/apps/library#77)

lerna complains about this

And remove the custom publish commands

Add a scope so we don't have to care about naming conflicts
and set the verison to 0.1.0 since we don't have a stable API yet.

While it's nice to have a fixed chrome version it slows down the yarn install,
downloads a lot of things, and the chrome version depends on various
system packages so one needss to have chromium installed anyway.

This means developers that want to work on tests need firefox and chdomium installed.

Sadly I couldn't find a way to make browsers optional in case the developer
only has one installed.

Use tdd in all cases to be more consisstend.
Also since last year we can use chai with rollup directly, so
do that everywhere instead of relying on karma-chai injecting
it in to the global scope.