Move 3.1.2

Fix source transition initialization

Use average z order of items

switched disappearing and appearing items

Warning: properties have changed since version 1.0.x this resets some settings.

• Split easing and curve properties for matched items, appearing items and disappearing items.
  Now you can give appearing items an other curve and easing than disappearing items.
• Added a override filter.
  You can use this filter on a source or a scene.
  If you use it on a source the override is used on all the scenes the source is used in.
  If you use it on a scene you can select the source of that scene that is affected.
• Added positions (Left,Top,Right,Bottom)
  This allows you to swipe sources in a direction instead of towards a point.
  

fix transition video stop signal

fix render source transition

add source matching options

add transition move scale type

fix crop movement
fix potential memory leak

added easing functions
added source matching methods
added source transitions

This version has now all the things I wanted in it so I made it version 1.0.0.

Allowing transitions like this: