map and ui: map spot callbacks, a bulk spot read, a few window additions and a minimap widget for scripts (linked PR # 3)

[TheLostInPlace]

LINKED PR # 3

This PR was split into a 4 part PR due to the size and to aid in reviewing changes

Changes

The map and ui pieces a script needs to show the level map on a screen held in the hand.

• two callbacks, on_map_location_added and on_map_location_removed, with the spot type and the
  object id (removals are collected on the map update thread and sent from the main thread), and a
  read of all spots with their current type in one call
• the type of a game task, where a server object sits on the level map, the nearest object of a
  class, the size of a texture, and the minimap icon a spot type declares
• a CUIStatic can be laid along the line between two points and tells where its heading pivot
  is, windows get a hide lock, mouse capture and clip rects
• the world space ui pass draws headings and the minimap without the screen aspect squeezing them
• CUIMiniMapWidget, a minimap window a script creates and puts inside any other window. It has
  its own spot pool, quest pointers are on only for the spot types the script asks for, the one
  followed target is the only spot searched from another level and that path is cached, and every
  texture and the spot shader can be replaced from script

The pda map and the hud minimap are untouched, apart from the cached path in
CMapLocation::UpdateSpot, which only saves a path search per frame. Every new export is listed in
lua_help_ex.script. Built DX11-AVX x64, tested in game Wearable Devices mod. On the MT branch UpdateSpot conflicts with a null check that lives there, the MT PR resolves it.