Several new methods + fixes

[zouter]

Additions:

• Add FORKS
• Add StemID/RaceID (from StemID/StemID2)
• Add projected methods
• Added examples for every method thanks to an enormous effort of @rcannood :clap: Updates:
  • Updated several default parameters and methods

[codecov[bot]]

Codecov Report

Merging #97 into master will not change coverage. The diff coverage is 0%.

@@         Coverage Diff          @@
##           master   #97   +/-   ##
====================================
  Coverage       0%    0%           
====================================
  Files          53    57    +4     
  Lines         574   605   +31     
====================================
- Misses        574   605   +31

Impacted Files	Coverage Δ
R/ti_celltree_maptpx.R	0% <ø> (ø)	:arrow_up:
R/ti_celltree_gibbs.R	0% <ø> (ø)	:arrow_up:
R/ti_paga.R	0% <ø> (ø)	:arrow_up:
R/ti_ouija.R	0% <ø> (ø)	:arrow_up:
R/ti_celltree_vem.R	0% <ø> (ø)	:arrow_up:
R/ti_projected_slingshot.R	0% <0%> (ø)
R/ti_projected_monocle.R	0% <0%> (ø)
R/ti_projected_gng.R	0% <0%> (ø)
R/ti_projected_dpt.R	0% <0%> (ø)
R/ti_forks.R	0% <0%> (ø)
... and 12 more

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