Switch to 128px images only, bug fixes

Now the 128-pixel images are used for the 64-pixel squares, halving the
image file requests.

CSVdata no longer cuts off the last row and column of the source files
when saving.

Updated a few squares' images and info.
Added title hover effects!
Fix bug in /play, edit page titles
Add tagline to title image
Fix permissions
Updated image, fix overlay css, change title html a bit
Add title animation easter egg
Add clear and random functions to configurator

One moves all squares from the board to the unused area, the other does
the opposite.

Also fixed the dim switch to be off by default, and dimmed a few more
squares.
Fixes to clear/random functions
Random button now recognizes difficulty level

Squares with difficulty set are always placed at that row on the board.
Switch images from 128px to 144px
Started LED display!
LED image now scrolls nicely across the screen
LED Arduino code now uses functions; scrolls random images
Refactored request_square, added request_line, started continuous scroll
Added LED title

Continuous scroll still doesn't work, for memory reasons.

Also started an image dump module, in case we want to upload images to
the Arduino as PROGMEM.
Update website main page
Link sponsor logos
Move gallery link above blurb
Move all squares into a single catalogue file