Add new MathCAT logo with hi-DPI and dark mode support, plus a versio… #360

Job	Run time
Build 32 bit windows pyd file	4m 31s
zip up the rules directory	1m 15s
Build linux pyd file (64-bit intel)	1m 54s
Build 64 bit windows pyd file	3m 22s
l10n	0s
build-addon	27s
Pre Release	18s
	11m 47s

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