1. implemented HAL_StatusTypeDef HAL_FLASH_ReadWord(uint32_t Address, uint32_t* Data); and HAL_StatusTypeDef HAL_FLASH_ReadHalfWord(uint32_t Address, uint16_t* Data); which allows user to read the internal FLASH (with out read protection)
2. implemeted device_config struct to store device configurations, e.g. magnetometer fullscale, report period, etc.
3. added demonstration code of using flash reading apis in lora_demo.c, in which the configuration sent from the cloud is stored into the internal Data EEPROM bank1, and each time when the device is booted, the configurations would be loaded from the Data EEPROM and used to initialize the application.
1. modified the HTS221: removed magic numbers, added a sensor_tempnhumi_t struct to accommodate temperature and humidity data
2. added .h and .c files for LIS3MDL magnetic sensor
3. added .h and .c files for LPS22HB pressure sensor
3. added IAR (EWARM) project for lorawan example
4. added bsp.c and bsp.h to manager the sensors
