AutoUV shaders [updated: 05/13/2020]

[micheus]

All the shaders files were reviewed and the settings for dialog improved.
- Shaders that allow user to select a different effect now uses the menu control instead of a number;
- The parameter values were set in order to make the default settings result in a similar pattern size;
- Except for Tile and Brick, all Scale parameters were renamed to Frequency since it represents better the result produced;
- All shaders except Tile and Brick has their parameters consistent among the texture resolution. The result is the same independent of the generated image size.

tkbd, I picked the names you used to reference each Hexagon type.