menu: SL0P MENU scaffolding with WARP as a submenu

Refactor the flat warp menu into a table-driven top-level SL0P MENU opened by
SELECT. Each entry = a name in SlopMenuText + a routine in SlopMenuHandlers;
handlers return carry set (a warp was started, exit) or clear (back to the
menu). Ships two entries:
  WARP -> WarpSubmenu (the 13-destination town list)
  HEAL -> SlopHealParty (restore party HP + clear status), demoing an action
Shared open/close display handling (hide sprites, single-space flags, wTileMap
push, restore). Add an entry by appending a name+handler and bumping
SLOP_MENU_COUNT. (renamed engine/warp_menu.asm -> engine/slop_menu.asm)

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