Add ability to specify cross-hatching and degree of cross hatch for repeated rasters

[robinsonmm]

When repeating tool paths on a surface, say for grinding, it is beneficial for the process to cross-hatch or rotate the orientation of the tool paths relative to the first set of tool paths. This could be specified as an angle of rotation relative to the first set of tool paths and the offset angle paths are run at either every other repeat or every 2, or what is specified by the operator.