Properly reinitialize tile_player_tile when the value changes in-game
Allow jewellery acquirement to grant more than regen and protection.
Lift and constify.
Various monster tiles (roctavian, 8928)
Fix tile_player_tile so that it can use all player tiles

This change uses a dummy monster to fill in the monster info for
mcache and sets the tile as a property. Previously we required there
to be a base monster for tile, but this prevented use of e.g. the
Cigotuvi's Monster tile. Any valid tile in the player tileset may be
used, so the requirement of a tile name beginning with "mons_" has
been dropped.
Weapon and shield offsets for various monster tiles