Integer init and setter for Samples

[orchetect]

Since working with audio samples is more idiomatic to whole integer sample counts and not fractional/floating point, add overloads for the existing audio samples inits/methods to take Int.

Rename existing:

Timecode

• samplesDoubleValue(sampleRate: Int) -> Double
• setTimecode(exactlySamplesValue: Double, sampleRate: Int) throws

Add overloads for:

Timecode

• samplesValue(sampleRate: Int) -> Int
• setTimecode(exactlySamplesValue: Int, sampleRate: Int) throws

[orchetect]

Done - will be in 1.5.0