Improved UART Timeout

Major:
- Improved UART Timeout: Apparently, the UART data Rx/Tx is quite unreliable (especially under motor load) leading to very often out-of-sync issues. This change allows to reset the DMA more often, leading to a faster re-sync of the UART transmission and thus avoiding UART timeout

Minor:
- added #define MPU_SENSOR_ENABLE to allow to enable/disable the MPU6050 sensor and save code size if the sensors is not needed
- fixed the orientation in the Processing sketch
- updated ReadMe

Src/mpu6050_dmp.c

@@ -23,11 +23,13 @@
 #include <stdio.h>
 #include <string.h>
 #include "systick.h"
+#include "config.h"
 #include "mpu6050.h"
 #include "mpu6050_dmp.h"
 #include "mpu6050_dmpKey.h"
 #include "mpu6050_dmpmap.h"
 
+#ifdef  MPU_SENSOR_ENABLE
 
 /* The following functions must be defined for this platform:
  * i2c_write(unsigned char slave_addr, unsigned char reg_addr,
@@ -1329,6 +1331,8 @@ int dmp_register_android_orient_cb(void (*func)(unsigned char))
     return 0;
 }
 
+#endif // MPU_SENSOR_ENABLE
+
 /**
  *  @}
  */