More Foragable/Plantable edibles for Autumn/Winter

[LambdaSix]

Add a few extra foragable berries for autumn and winter, some are summer. Also add recipes for using the berries/tubers/roots gathered.

• [ ] Add new shrubs/plants and forage resources (overrides?)
• [ ] New Shrub/Berry/Foragables
• Elderberry (Sambucus canadensis) Nectar, Syrup, Summer harvest
• [x] Burdock Added by mainline
• [x] Fox Grape (Vitis labrusca) Brewable, Juice, Autumn harvest Added by mainline
• Groundnut (Apios americana) Legume, Food, Summer harvest
• Indian Cucumber (Medeola virginiana) Edible roots, Autumn harvest
• New Jersey Tea (Ceanothus americanus) Tea, Autumn harvest
• Spicebush (Lindera benzoin) Pepper analogue, Autumn harvest - (Seasoned food recipes?)
• Staghorn Sumac (Rhus typhina) Berries, Juice, Winter harvest
• Nannyberry (Viburnum lentago)

  The fruit of some species (e.g. V. lentago) are edible and can be eaten either raw or for making jam, while other species (e.g. V. opulus) are mildly toxic and can cause vomiting if eaten in quantity. The bark of some species is used in herbal medicine, as an antispasmodic and to treat asthma. Berries, Jam, Autumn harvest

• Wintergreen (Gaultheria procumbens) Berries, Winter harvest

[LambdaSix]

Investigate if we can modify the mapgen settings without overriding the entire thing. If we do have to override the entire thing then create a new issue to create two side-mods (?) tracking both standard mapgen and rural_mapgen?