Modern Life

Fix pngChecksumThread error
Remember prior button when using color picker on easel

Add server rate limiting config options to limit how much camera data can be sent at once
By default these new limits are enabled

Fixed issue where image tooltip previews may briefly not load correctly
Added new block Warning Alarm
Added client config options to control Warning Alarm properties

Add camera/easel support for JPG - default remains PNG
Added new Common config options to enable JPG
Changed image preview tooltip to be much larger
Added client config option to control tooltip preview sizes
Add grass ramp
Add end stone ramp
Bookshelf block no longer has to be placed against a wall
Bicycle now interpolates movement instead of being choppy

Add Inverted Light Bulb
Add Inverted Tile Light
Image checksum threadpool now runs in the background during startup
Shutdown image checksum threadpool after finishing computation