More new dungeon build functions, and some adjustments.

Adjusted _valid_coord to allow the checking of a coordinate without
generating an error message; moved fill_area's filling code to its own
function so that it can be called by multiple functions; implemented
count_passable_neighbors in C++ instead of Lua, to make it more
accessible in multiple layouts.

Implemented "make_box" and "make_box_doors"; both work on a series of
two coordinates (top left and bottom right corners), the first making a
box of specified width and using specified glyphs for walls and floor,
while the second function will randomly add doors to the box, ignoring
corners.

make_box_doors will not work on instances where the wall thickness is
more than 1 square; this could be adjusted at a later date.

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