Allow changing warpFactorLevels (in warp.m) using the ARTwarp Menu

[RohanK22]

It is tested on warpfactor levels 3,4,5,100 and it appears to work without crashing. In general, as the warp factor increases (which kind of means it allows more stretching and squishing along the time axis) the number of categories goes down. This is might be a flawed observation, but it makes sense because warping whistles on a larger scale (larger warp level) will make them look similar, leading to fewer groups being made.

Problems:

- When the level is set to 0,1, or 2, it throws an error saying it is unable to unwarp a
whistle.

- There is time warping and frequency warping taking place on both axes according to the
comments at the start of the 'warp.m' script. So it is a bit ambiguous which 3 refers
to which axis in the code. I have just replaced most of the 3s with the variable
'warpFactorLevel'.

Attempts to resolve issue #12

[olexandr-konovalov]

This need to be rebased, to resolve conflicts.