Refactor project structure: update Java version, remove MQ7 files, and add BMP280 support

hardware/include/MQ7.h

@@ -0,0 +1,7 @@
+#include <Arduino.h>
+ 
+#define ANALOG_MQ7 33
+#define DIGITAL_MQ7 32
+ 
+void MQ7_Init();
+void MQ7_Read();