The big memory allocation for tiles that was unfreed according to
heaputil was actually freed by X according to a comment in the code.
But free it explicitly for #if MONITOR_HEAP so that the alloc/free
tracking stays accurate.
Also, the cached extended commands menu was not being freed, so take
care of that. I wasn't sure where to handle it; I ended up making it
happen when the map window is torn down.
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