Added paintable flow directions + exp frequency growth

- You can now paint the directions of the gabor using Mari's Vector Flow. It is useful to start out with an Object Normal Layer and then add changes to a separate layer. Local scaling of features is possible by painting Values of Red (X), green (y) and blue (z).

- exponential frequency growth, offset and seed features were added for larger scene sizes.

- the node is now tagged as an _adjustement in order to allow inheriting vector paint data.