- get_terrain and set_terrain replaced with direct indexing operations
- get_map_size mostly replaced with either the iterator or an on_board call.
Only a few cases really needed to know the size of the map for some other purpose.
- shroud and fog operations, village owner, time areas, and location filters
- get_terrain_info replaced with terrain_types table
- Map generation functions create_map and create_filter
This replaces the Reset button with a dedicated listbox entry, and
replaces the selection status text with code that sets the initial
selection for the listbox and an icon that's used to display whether a
selection applies globally or only to the current unit.
This does alter some of the code significantly to make it less "clever"
(no more dynamic build) but also less hostile to future modifications
like this.
(CC #5555)
