v0.0.3

• Add print process
• Add printer class with notification server
• Use anti-aliased filled circles to indicate the remaining captures number
• Add countdown before each capture
• Use PIL image to display merged picture + add time info in logs
• Remove offset on preview position
• Make Python wheel generated as universal
• Update HW material list in the README
• Remove instruction state
• Keep preview during the whole time image are taken
• Add a LED for print action