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Since this was originally Pascal, there's a tonne of 1-based indexed
arrays, and the font ones were sized by number of elements, meaning
it was chock full of buffer overflows.  Also, the Pascal string
handling was crazy.

There were also some file IO issues floating around.

This fixes all of those issues and also Closes #179

buffer overflow caused by long-filenames (?) :

Thread 2 "SDL Main" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff0be5700 (LWP 31102)]
strlen () at ../sysdeps/x86_64/strlen.S:106
106../sysdeps/x86_64/strlen.S: No existe el fichero o el directorio.
(gdb) bt
#0  strlen () at ../sysdeps/x86_64/strlen.S:106
#1  0x00007ffff6f10da8 in _IO_vfprintf_internal (s=s@entry=0x7ffff0bc2230,
format=<optimized out>, format@entry=0x55555558ec5c "%-12s ",
    ap=ap@entry=0x7ffff0bc2378) at vfprintf.c:1637
#2  0x00007ffff6f31afb in __IO_vsprintf (string=0x7fffec00b0c0 "\310\a",
format=0x55555558ec5c "%-12s ", args=0x7ffff0bc2378) at iovsprintf.c:42
#3  0x000055555556a701 in bufprintf (buf=0x7ffff0bc2480 "", attr=31,
fmat=0x55555558ec5c "%-12s ") at miscfunctions.c:560
#4  0x000055555555e332 in load () at load.c:796

This fixes the loading CTRL-A codes from *.msg files reported by Marius.

If the file uses a known extension, do not pass through all the parsers.

and imporived mouse support using the ciolib infterface (*nix and Win32)
Many more improvements and UI cleanups are really needed someday.