fixed that 'clear' call with color/alpha on RenderTexture did not work when done before drawing
added missing dispose call in 'drawToBitmapData'
added missing dispose call in internal 'compile' method of FragmentFilter class
fixed some typos in comments
now using relative paths for embedded assets in sample projects

That makes it easier to compile them in other IDEs (like IntelliJ) because it may avoid having to modify the source paths.
added helper script for IntelliJ debugging

The Ruby script provides a workaround for a bug in IntelliJ: it does not copy the specified resources into the output-directory when running/debugging the app in the simulator. Configured as an external tool, the script can do just that.

-> https://youtrack.jetbrains.com/issue/IDEA-94578