Examples for PraxisLIVE v4.0-180627

Update examples for v4 (#2)

* Remove some old examples.

* Update basic examples for 4.0.0-rc1

* Update (or remove) audio and video examples for 4.0.0-rc1

Old v1 examples

These are the old v1 examples from the Google Code repository. They should work OK in v2, but proper v2 examples are coming!