Add mouseClickWithWait and mouseClickWithButtonAndWait

[53845714nF]

I create two new functions, mouseClickWithWait and mouseClickWithButtonAndWait.
These functions wait that an Element exist and then click. It saves the wait commands that would otherwise have to be made.

from xmlrpc.client import ServerProxy

session = ServerProxy('http://localhost:9000')

session.mouseClickWithWait('mainWindow/buttonImage', 400)
session.mouseClickWithButtonAndWait('mainWindow/buttonImage', 1,  400)

mouseClickWithWait have two parameters, the first the path and the second the timeout.
mouseClickWithButtonAndWait have the path, the mouse key and the timeout.