Add some more themed rooms

[copperwater]

• [ ] Minesweeper: mines in certain places, "X" burnt over them, numbers burnt on adjacent squares, no engraving for 0s
• [ ] The Casque of Amontillado - room with a walled off closet (actually walled off, not just floating in stone like regular closets) with the engraving "Amontillado!", a human corpse, and a potion of booze.
• [ ] Triple Rhombus V2 - three rhombuses in a horizontal line and interconnected.
• [ ] Spikes / Pennants - line of room squares with three up or downward pointing triangles from it
• [ ] Monster sauna - a few towels and steam vortices (may or may not contain other monsters). No lava. If possible, force any doors to be closed.
• [ ] Wizard's Study - disconnected room that contains several books and a few scrolls and a teleportation trap
• [ ] Room with a number of gems scattered around (random gems, probably mostly glass)
• [ ] secret compartment room with a secret door leading into a room with some treasure (this may need to wait on something that prevents the smaller room from being joined, but perhaps it can be done by making it nonjoined)
• [ ] Ring - small circle center with a 1-wide ring around the outside (try to keep circular rather than angular), type=themed
• [ ] Red Room (also other colors): room filled (not TOTALLY filled) with red colored things like dwarves, red spellbook, lava, etc
• [ ] gehennom special room port: submerged room, only on deeper floors, remove magic lamp from treasure chest
• [ ] gehennom special room port: statuary, this should be rarer than normal themed rooms; rather than mess with its frequency, just give it no special contents some percent of the time

Edits to existing themed rooms:

• "Garden" should occasionally have one or two gnome statues made of stone.