Decide about potential Gathering split

[LordPeter]

atm, Gathering gives a lot of wildly different products, and most of them are found in wildly different biomes. The currently used generic "gathering" cap type thus does not really make sense.
This is also somewhat connected to #18, as insects will be split up depending on whether they are gathered or cultivated.
So question is: split gathering into several subtypes (forest, marsh, etc), or keep it as it is, and do sth else... (maybe moving certain products to e.g. forestry)?

• rename gathering cap to "vegetation"
• check if adjustments need to eb made
• rename hunting cap to "wildlife"

[LordPeter]

Idea: Since gathering is mostly about plant-related products, instead rename the cap to a generic "vegetation" cap, which represents the amount of natural vegetation found in the province. The type of vegetation is not important here, that later defines which products are available where.
Just so this looks good, maybe also rename "hunting" to "wildlife", so it does not denote the activity, but the target.