Based on CoX Peripheral Interface version V2.1.
Check wrong words and grammar for code notes and doxygen document.
Add the APIs of peripheral clock source selecting and frequency division In the SysCtl module.
Add APIs of peripheral enable, disable and reset (Which is convenient for drivers coding, for it can directly pass peripherals base address for passing parameters.)
Correct the RTC interrupt clear bug.
Improve the test framewrok.
Correct the error ACMP interrupt function name.
Correct the bug in SysCtlBODLowPowerModeEnable.
Correct the bug in SPIDivOneFunction.
Correct the bug in I2CIntCallbackInit.
Correct the bug of I2S peripheral pin selecting and GPIODebounceTimeSet in the GPIO.
Correct the bug of UART baud setting error under different clock source.
Correct the bug in PWMFrequencyConfig.
Correct the bug in GPIOPinIntCallbackInit.

We re-write the cox, for the initial version's drawbacks.

CoX Peripheral Interface initial version.