Ben Harris 942d883d9b Range-check normal moves in Undead
Normal moves shouldn't be allowed to write outside the board.  This
buffer overrun can be demonstrated by building Undead with
AddressSanitizer and loading this save file:

SAVEFILE:41:Simon Tatham's Portable Puzzle Collection
VERSION :1:1
GAME    :6:Undead
PARAMS  :5:4x4dn
CPARAMS :5:4x4dn
DESC    :48:5,0,5,cRRaLRcLRc,0,2,1,3,1,0,0,3,4,3,2,3,4,2,1,1
NSTATES :1:2
STATEPOS:1:2
MOVE    :3:Z10
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This is the README accompanying the source code to Simon Tatham's
puzzle collection. The collection's web site is at
<https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>.

The puzzle collection is built using CMake <https://cmake.org/>. To
compile in the simplest way (on any of Linux, Windows or Mac), run
these commands in the source directory:

  cmake .
  cmake --build .

The manual is provided in Windows Help format for the Windows build;
in text format for anyone who needs it; and in HTML for the Mac OS X
application and for the web site. It is generated from a Halibut
source file (puzzles.but), which is the preferred form for
modification. To generate the manual in other formats, rebuild it,
or learn about Halibut, visit the Halibut website at
<https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
Description
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Readme 26 MiB
Languages
C 93.3%
JavaScript 1.4%
Objective-C 1.1%
CMake 1.1%
HTML 0.8%
Other 2.2%