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, 19 insertions, 0 deletions

diff --git a/apps/plugins/puzzles/src/html/tracks.html b/apps/plugins/puzzles/src/html/tracks.html
new file mode 100644
index 0000000..afabed3
--- /dev/null
+++ b/apps/plugins/puzzles/src/html/tracks.html
@@ -0,0 +1,19 @@
+Tracks
+<p>
+Complete the track from A to B so that the rows and
+columns contain the same number of track segments as are indicated in the
+clues to the top and right of the grid. There are only straight and
+90-degree curved rail sections, and the track may not cross itself.
+<p>
+Left-click on an edge between two squares to add a track segment between
+the two squares. Right-click on an edge to add a cross on the edge,
+indicating no track is possible there.
+<p>
+Left-click in a square to add a colour indicator showing that you know the
+square must contain a track, even if you don't know which edges it crosses
+yet. Right-click in a square to add a cross indicating it contains no
+track segment.
+<p>
+Left- or right-drag between squares to lay a straight line of is-track or
+is-not-track indicators, useful for filling in rows or columns to match the
+clue.