Implement game logic and MQTT communication (charger)

[archerindigo]

• [x] Establish MQTT connection
• [x] Implement game logic
• [x] Handle MQTT messages

[archerindigo]

Todo:

• [x] Update/ Handle MQTT topics with the latest payload format:
  • [x] 5/battery/1/level
  • [x] 5/battery/1/uid
  • [x] 5/battery/1/location
• [x] Fix problem that the battery level is being updated frequently after fully charge
• [x] Tune the loop cycle period so that MQTT messages can be handled in time and NFC reader is stable

[archerindigo]

Pushed commits:

Fix syntax error ee644e80b39613f10837e158c0982cb57a8d672a

Update comments and coding style da14b4a7f75f4acde96ee1ddd6c063451c00257e

Minor code refactor 3fec8f536b554afb7413ca88171ee33275bc4ae5

Charger: Prompt to close the lid after fully charge 0c7265c390d70c696715e3b9f25b159ad717d1b4