Feature/set

[WilcoSp]

This PR adds several set* functions to Tempo and moves the code from addYear & addMonth for date overflow to a separate function

functions that will be added:

• setMilliseconds
• setSeconds
• setMinutes
• setHour
• setDayOfMonth (chose this name as it's clearer)
• setMonth
• setYear
• handleOverflow (for setYear, setMonth, addYear, addMonth)

if wanted I could also add a set and a setDayOfYear function

[vercel]

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