Extract watcher to separate package

[silkentrance]

We need additional integration tests here.

[silkentrance]

Putting this on halt for now as it is not an important feature to have.
Will reopen as soon as I find the time.

[silkentrance]

Note: jest comes with its own watcher and which is working just fine so we do not a watcher for that.

[silkentrance]

https://stackoverflow.com/questions/48568671/how-to-run-jasmine-tests-in-watch-mode-for-typescript

[silkentrance]

mochajs/mocha#2444

[silkentrance]

so eventually we can completely remove the watcher and just update our seeds with the required information

[silkentrance]

last time I checked, mocha does now provide its own watcher. Jest also comes with its own watcher.
For jasmine, there exist workarounds. However, @testdeck/jasmine downloads are very low and removing the watcher altogether seems fine with me.

[silkentrance]

Closing as this should be depcrecated. And I do not care about jasmine.