1.Support adding plot by data range string.

gl.add_plot(f'{wks.lt_range()}!(?,1:end)')

2.Added group()function to Graphlayer class to group plots.

3.Support setting color list and shape list for group plots.

plot.colormap = 'Candy'
plot.shapelist = [3, 2, 1]

4.Support setting color and symbol increment for grout plot.

pl.colorinc
pl.symbol_kindinc