Provide a classifier that calculates noise-segments

[laeubi]

We already have noise-calculation available, but this is not very "processing-friendly" because it can only be called from user code, and users have little control over it. On the other hand this could be really useful to improve the performance of the first-derivative (or other) peak detectors. To fill the gap, a Classifier should be provided with the following properties:

• if there are no noise-segment available in the chromatogram, segments are calculated for the whole chromatogram using user settings regardless of chromatogram range (initial seed)
• if later the users chooses a different range and triggers the classifier again (maybe with different settings) the segments in that given range are replaced by the newly calculated ones, ones in other areas are preserved
• a user can edit segments based on retention time or delete segments
• segments should be visualized inside the chromatography editor for easy checking the bounds
• it should also be possible to drag segment bounds, so the user can change bounds in an intuitive way

For processors, we offer a method that allows to fetch segments for a given range, the method should work the following way:

• If there are no segments yet, segments are created with system default settings
• If there are already segment (either from initial seed or from user changes), then these are used

[laeubi]

A first version is now available, one can call

org.eclipse.chemclipse.chromatogram.xxd.calculator.core.noise.
NoiseChromatogramClassifier.getNoiseSegments(IChromatogram<?>, IScanRange, boolean, IProgressMonitor)

to get Noise-Segments from given Chromatogram in the requested range. This return Noise-Segments of the TIC.