Cassiopeia

New features.

• Added error popup.
• Nodes can be drag en dropped.
• Added create constellation when right clicking on project window.
• Added Quit node.

Improvements

• Node selector window can be resized
• Updated the flappy bird example and fixed bugs in the project.

Refactoring:

• Cleaned editor scripts.

Fixes

• Fixed memory leaks with sender and receiver nodes.
• Removed Warnings in editor for transform and audio source node.