ggfoundry 0.2.0

• 2 shapes ("jar" & "tube") added to a "container" set (#1).
• 8 shapes ("sunflower1" to "sunflower8") added to a "flower" set (#4).
• 3 shapes ("gentoo", "chinstrap" & "adelie") added to a "penguin" set (#5).
• Invalid-shape error message notes shape may be in DEV (#2).
• New shapes_cast() creates a data frame of available sets & shapes (#3).
• Reduced sysdata.rda size by 23% switching from "bkzip2" to "xz" (#6).
• Fixed shapes outside plotting area when "zooming" (#7).
• Showcase vignette added.