Move token layout panel to its own tab in edit token dialogue

[bubblobill]

EditTokenDialog

1. Added checkboxes for Flip-X, Y, and Iso
2. Incorporated Unique Light Sources text area
3. Moved token layout panel to it's own tab

Four additional classes:

1. SpinnerSliderPaired ties a JSpinner and a JSlider together with some bells and whistles
2. TokenLayoutRenderPanel contains the paint method and handles mouse events
3. TokenLayoutRenderPanelHelper handles the initialisation code for control elements and a bunch of methods for creating and drawing various elements and onscreen guides
4. MathUtils a generic utils class for doing math stuff. Math operations in other classes should probably be moved to it too.

GraphicsUtil added method createGridShape() for generating a grid shape consistently.

ImageUtil added a bunch of methods for operations to reduce ZoneRenderer code duplication:

1. getIsoFigureHeightOffset
2. getTokenImage - returns token image or table image if iso figure
3. flipCartesian - for flipped token images
4. flipIsometric - for flipped token images
5. getRenderingHintsQuality - a single source for a number of higher quality rendering hints
6. rotateImage - rotates an image
7. getScaledTokenImage - accounts for ZoneRenderer zoom level, token sizeScale, scaleX, scaleY and footprint size and scale
8. getTokenRenderImage - does most of these in appropriate order to maintain best image quality