Eliminate steps in applySamplePadding()

[nwolek]

Detailed discussion in pull #83

[nwolek]

Function can be found here: https://github.com/jamoma/jamoma2/blob/master/include/core/JamomaSample.h#L262

Lines 273-291 are the ones that we would like to improve / consolidate.

Test for this function can be found here: https://github.com/jamoma/jamoma2/blob/master/test/SampleBundle/SampleBundle.cpp#L215

[tap]

specifically, this comment:

We made a copy up above (see my previous comment). But we shouldn't need to copy here. We should be able to move instead. Might have to use std::move here. @nwolek , please feel free to make me a ticket to investigate this. Even if we have to copy up above, maybe we can cut our trouble down here somewhat?