Add other simulation models

[lazappi]

This is a running list of other simulation models that could be added to Splatter. Adding new models is currently not a priority but it will be considered if there is a need from the community. Any pull requests implementing these models would also be warmly welcomed!

If you would like to discuss a particular model please comment on the specific issue for that model (or create one if it doesn't exist).

Issue	Model	Code	DOIs
#2	CIDR	https://github.com/VCCRI/CIDR	10.1101/068775, 10.1186/s13059-017-1188-0
#8	Qui
#12	PowSimR	https://github.com/bvieth/powsimR	10.1093/bioinformatics/btx435, 10.1101/117150
#18	zingeR	https://github.com/statOmics/zingeR	10.1101/157982
#33	dropsim	https://github.com/marchinilab/dropsim
#34	zinbwaveZinger	https://github.com/statOmics/zinbwaveZinger
#43	ccfindR		10.26508/lsa.201900443
#44	LineagePulse	https://github.com/YosefLab/LineagePulse
#50	CancerInSilico	https://github.com/FertigLab/CancerInSilico	10.1101/328807
#54	SymSim	https://github.com/YosefLab/SymSim	10.1038/s41467-019-10500-w, 10.1101/378646
#55	bayNorm	https://github.com/WT215/bayNorm	10.1101/384586
#59	M3Drop	https://github.com/tallulandrews/M3Drop	10.1093/bioinformatics/bty1044, 10.1101/065094
#63	NetNMF-sc	https://github.com/raphael-group/netNMF-sc	10.1101/544346
#70	scDesign	https://github.com/Vivianstats/scDesign	10.1101/437095