When attaching a control object to an AutomationPattern initialize the
value at position 0 with the current value of the control object.
This is similiar to the behaviour found in LMMS < 0.4.14 and has been
reintroduced as requested by some users.
Closes#535.
In automation patterns there always had to be a value at position zero
which also had a special semantic concerning the initial values of
connected objects. However that logic was buggy and confusing.
I therefore completely removed the neccessity for a value at position
zero (automated value will be 0 until the first set point).
If the settings for an AutomationPattern contain just one value at
position 0, this value was not loaded properly. Thanks to raine for
pointing out this issue and providing a patch.
Closes#3448562.
