Pixel placement log / pixels.log

Fixes #57 (closed)

Events:

• pixel place
• pixel undo
• mod override
• mod fill
• mod rollback (not implemented)
• mod rollback undo (not implemented)
• canvas size
• canvas freeze (See #76 (closed))
• canvas unfreeze (See #76 (closed))

Line:

• {timestamp} {user.sub} pixel_place {x} {y} {hex}
• {timestamp} {user.sub} pixel_undo {x} {y} {hex} -- hex being what the pixel is now
• {timestamp} {user.sub} mod_override {x} {y} {hex}
• {timestamp} {user.sub} mod_fill {x1},{y1} {x2},{y2} {hex}
• {timestamp} {user.sub} mod_rollback {x} {y} {hex} -- hex being what the pixel is now
• {timestamp} {user.sub} mod_rollback_undo {x} {y} {hex} -- hex being what the pixel is now
• {timestamp} system canvas_size {width} {height}
• {timestamp} system canvas_freeze
• {timestamp} system canvas_unfreeze

Log file is written to packages/server/pixels.log unless if PIXEL_LOG_PATH is set, then it will use that as the path

This file is intended as public data, and to not be used as a complete audit log