gd32450i-eval/app/bmc

1. Add sensors
- sensor_driveer.c Add new driver
- sensor_sdr.c Add new SDR
- main.h SENSOR_NUMBERS = ?

2. Web Access IPMC through SendMessage and GetMessage command

3. UserInfoTbl
UserInfo 保存在flash里，offset = 0x800000； UserId从1开始。
g_BMCInfo.UserInfoTbl[0]: UserId = 1
g_BMCInfo.UserInfoTbl[1]: UserId = 2
g_BMCInfo.UserInfoTbl[2]: UserId = 3
...

4. SessionTblInfo
所有的当前会话信息均保存在SessionTblInfo里，Init_SessionTbl用来初始化结构体。