Lots of updates for version release

[joshwlambert]

PR changes include: Functions

• added add_island_colonist()
• added add_multi_missing_species()
• added benchmark()
• added count_missing_species()
• bug fixes for various functions
• added endemicity_to_sse_states(), get_sse_tip_states(), endemicity_to_sse_states(), sse_states_to_endemicity(), select_endemicity_status()
• added extract_stem_age(), added extract_stem_age_asr(), added extract_stem_age_genus(), extract_stem_age_min()
• updates to class methods
• added plot_performance()
• added plot_sensitivity()
• added read_performance()
• added read_sensitivity()
• added sensitivity(), added performance()
• added rm_island_colonist()
• added rm_multi_missing_species()
• added unique_island_genera()
• added BioGeoBEARS helper functions

Vignettes

• added sensitivity vignette
• added extending_asr vignette
• updated tutorial vignette

Package stuff

• updated documentation
• updated tests
• updated workflows
• updated author list
• updated data stored in package