code style in juma_sdk_api.h

[gilbertjuly]

I see there is a bunch of APIs listed in juma_sdk_api.h.

However, all of they are mixed together, I suggest APIs of different categories should be separated.

For example:

/*BLE*/
void ble_device_get_id(uint8_t* id, uint8_t len);
void ble_device_select_address(uint8_t id);
void ble_device_set_name(const char* device_name);
void ble_device_set_advertising_interval(uint16_t interval);
void ble_device_set_tx_power(int8_t tx_power);
void ble_device_start_advertising(void);
void ble_device_stop_advertising(void);
void ble_device_disconnect(void);

/*spi*/
void spi_setup(spi_init_struct_t * spi_struct);
void spi_transmit_receive(uint8_t * tx_buff, uint8_t * rx_buff, uint32_t buff_len);

/*GUI*/
void gfx_init_screen(uint8_t* buffer, uint16_t width, uint16_t height, uint8_t flags);
void gfx_clear(void);
void gfx_draw_pixel(uint16_t x, uint16_t y, uint8_t ppo);
void gfx_draw_line(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint8_t ppo);
void gfx_draw_rect(uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint8_t ppo);
void gfx_fill_rect(uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint8_t ppo);
void gfx_draw_circle(uint16_t x, uint16_t y, uint16_t r, uint8_t ppo);
void gfx_fill_circle(uint16_t x, uint16_t y, uint16_t r, uint8_t ppo);
void gfx_set_font(const gfx_font_t* font);