Refactor the time strategies

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Create an enum for strategies:

• CLOCK_REALTIME
• CLOCK_MANUAL
• CLOCK_AUTO_INCREMENT

Create the functions that matches each strategies:

• setMicrosAutoIncrement()
• setMillisAutoIncrement() (or define millis() from micros())
• setMicrosManualTime()
• setMillisManualTime()

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Regroup functions by strategies.

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The CLOCK_MANUAL strategy may not be required. The CLOCK_AUTO_INCREMENT strategy may be redundent.

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CLOCK_SIMULATION need to be renamed to something better like CLOCK_AUTO_INCREMENT or CLOCK_INCREMENTAL. The solution must clearly identify that time increases automatically by a given step each time the millis() or micros() function is called.

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The setMicrosResolution() function will remain the same to be consistent with the arduino micros() function documentation which uses the term 'resolution' instead of 'increments'. The function may be renamed to setMicrosecondsResolution(). The documentation of the function should state that it defines the minimum increments of the microseconds counter.