servo for scratchClient

During a conversation on scratch forum there have been quite a few issues to get a servo run on someones computer.

Here a video on installation scratchClient on a new sd card, run scratchClient and prepare a script in scratch1.4.

install scratchClient and running servo sample.

The sequence is shortened a bit. Especially the system update is at multiple speed.

When the servo moves, there is noticeable jitter. Caused by delays in python and operating system.