Write functions in R to produce figures and tables for assessment not included in R4SS for integration into R markdown.

[zandjyo]

• [x] Fishing effort maps
• [x] Survey distribution maps
• [x] Historical spawning biomass estimates (figure)
• [x] Phase plane plot (figure)
• [x] Projection scenario (figure)
• [x] Ensemble figures
  • Total biomass
  • Spawning biomass
  • Age-0 recruits
  • Fishing mortality
• [x] All tables...