Add CnC map generator support

Adds map generator support for CnC (all tilesets), largely on par with
RA.

Most tilesets do not have a complete set of beach templates and
therefore do not support terrain settings involving water. DESERT is the
only tileset supporting water. Unlike in RA, water is not playable space
in CnC (no naval units), so only terrain settings with small bodies of
water are available.

Most changes are configuration (tileset and map generator config), with
just a small number of code changes.

mods/cnc/fluent/rules.ftl

@@ -51,6 +51,9 @@ faction-nod =
      and the alien substance Tiberium. They use stealth technology
      and guerilla tactics to defeat those who oppose them.
 
+map-generator-ra = RA Experimental (CnC)
+map-generator-clear = Clear
+
 ## defaults.yaml
 notification-unit-lost = Unit lost.
 notification-unit-promoted = Unit promoted.
@@ -776,3 +779,65 @@ bot-watson =
 
 bot-hal9001 =
    .name = HAL 9001
+
+## map-generators.yaml
+label-clear-map-generator-option-tile = Tile
+label-clear-map-generator-choice-tile-clear = Clear
+label-clear-map-generator-choice-tile-water = Water
+
+label-cnc-map-generator-option-seed = Seed
+
+label-cnc-map-generator-option-terrain-type = Terrain Type
+label-cnc-map-generator-choice-terrain-type-lakes = Lakes
+label-cnc-map-generator-choice-terrain-type-puddles = Puddles
+label-cnc-map-generator-choice-terrain-type-gardens = Gardens
+label-cnc-map-generator-choice-terrain-type-plains = Plains
+label-cnc-map-generator-choice-terrain-type-parks = Parks
+label-cnc-map-generator-choice-terrain-type-woodlands = Woodlands
+label-cnc-map-generator-choice-terrain-type-overgrown = Overgrown
+label-cnc-map-generator-choice-terrain-type-rocky = Rocky
+label-cnc-map-generator-choice-terrain-type-mountains = Mountains
+label-cnc-map-generator-choice-terrain-type-mountain-lakes = Mountain Lakes
+
+label-cnc-map-generator-option-rotations = Rotations
+
+label-cnc-map-generator-option-mirror = Mirror
+label-cnc-map-generator-choice-mirror-none = None
+label-cnc-map-generator-choice-mirror-left-matches-right = Left vs right
+label-cnc-map-generator-choice-mirror-top-left-matches-bottom-right = Top left vs bottom right
+label-cnc-map-generator-choice-mirror-top-matches-bottom = Top vs bottom
+label-cnc-map-generator-choice-mirror-top-right-matches-bottom-left = Top right vs bottom left
+
+label-cnc-map-generator-option-shape = Bounds Shape
+label-cnc-map-generator-choice-shape-square = Square
+label-cnc-map-generator-choice-shape-circle-mountain = Circle in mountains
+label-cnc-map-generator-choice-shape-circle-water = Circle in water
+
+label-cnc-map-generator-option-players = Players per side
+
+label-cnc-map-generator-option-resources = Resources
+label-cnc-map-generator-choice-resources-none = None
+label-cnc-map-generator-choice-resources-low = Low
+label-cnc-map-generator-choice-resources-medium = Medium
+label-cnc-map-generator-choice-resources-high = High
+label-cnc-map-generator-choice-resources-very-high = Very High
+label-cnc-map-generator-choice-resources-full = Oreful
+
+label-cnc-map-generator-option-buildings = Buildings
+label-cnc-map-generator-choice-buildings-none = None
+label-cnc-map-generator-choice-buildings-standard = Standard
+label-cnc-map-generator-choice-buildings-extra = Extra
+label-cnc-map-generator-choice-buildings-oil-only = Oil Only
+label-cnc-map-generator-choice-buildings-oil-rush = Oil Rush
+
+label-cnc-map-generator-option-density = Entity Density
+label-cnc-map-generator-choice-density-players = Scale with players
+label-cnc-map-generator-choice-density-area-and-players = Scale with area and players
+label-cnc-map-generator-choice-density-area-very-low = Scale with area (very low density)
+label-cnc-map-generator-choice-density-area-low = Scale with area (low density)
+label-cnc-map-generator-choice-density-area-medium = Scale with area (medium density)
+label-cnc-map-generator-choice-density-area-high = Scale with area (high density)
+label-cnc-map-generator-choice-density-area-very-high = Scale with area (very high density)
+
+label-cnc-map-generator-option-roads = Roads
+label-cnc-map-generator-option-deny-walled-areas = Obstruct walled areas