puzzles: refactor and resync with upstream

This brings puzzles up-to-date with upstream revision
2d333750272c3967cfd5cd3677572cddeaad5932, though certain changes made
by me, including cursor-only Untangle and some compilation fixes
remain. Upstream code has been moved to its separate subdirectory and
future syncs can be done by simply copying over the new sources.

Change-Id: Ia6506ca5f78c3627165ea6791d38db414ace0804

1 files changed, 21 insertions, 0 deletions

diff --git a/apps/plugins/puzzles/src/html/range.html b/apps/plugins/puzzles/src/html/range.html
new file mode 100644
index 0000000..bb5b59c
--- /dev/null
+++ b/apps/plugins/puzzles/src/html/range.html
@@ -0,0 +1,21 @@
+Range
+<p>
+Colour some squares black, so as to meet the following conditions:
+<ul>
+<li>
+No two black squares are orthogonally adjacent.
+<li>
+No group of white squares is separated from the rest of the grid by
+black squares.
+<li>
+Each numbered cell can see precisely that many white squares in
+total by looking in all four orthogonal directions, counting itself.
+(Black squares block the view. So, for example, a 2 clue must be
+adjacent to three black squares or grid edges, and in the fourth
+direction there must be one white square and then a black one beyond
+it.)
+</ul>
+
+<p>
+Left-click to colour a square black. Right-click to mark a square
+with a dot, if you know it should not be black.