🐛 Optional colour formatting

[ollyhensby]

*Issue
Make the colour formatting optional

Here is the code that deals with that:

xlsxdatagrid/src/xlsxdatagrid/xlsxdatagrid.py

Lines 491 to 520 in 9714832

	palettes_in_use = []
	self.header_sections = [h for h in self.header_sections if h in ix_nm]
	di_section_colors = {}
	for h in self.header_sections:
	sections = list(set([getattr(f, h) for f in self.gridschema.fields]))
	colors = get_color_pallette(len(sections), palettes_in_use)
	di_section_colors = di_section_colors | {
	h: [(s, c) for s, c in zip(sections, colors)]
	}
	for v in di_section_colors.values():
	self.formats = self.formats | {f"{l[1]}": {"bg_color": l[1]} for l in v}
	for k, v in di_section_colors.items():
	r1, c1, r2, c2 = self.rng_headers[ix_nm.index(k)]
	for _ in v:
	self.conditional_formats = self.conditional_formats + [
	[
	r1,
	c1,
	r2,
	c2,
	{
	"type": "cell",
	"criteria": "equal to",
	"value": '"{0}"'.format(_[0]),
	"format": _[1],
	},
	]
	]