[FEATURE] Data processing wizard to help guide users

[AlanRace]

Inclusion of a 'wizard' interface when data is loaded would allow a faster (and new-user friendly) route to the desired functionality. This could take the form of a window which has buttons (with title, and then detailed description of what will happen to the data) for the following:

• Annotate my data (automatically select appropriate preprocessing and generate a mean spectrum, perform peak picking with default noise thresholds and open the annotation window)
• Browse images (if data already reduced to peaks, load in memory if possible for fast browsing. If data not reduced to peaks, then automatically select appropriate preprocessing and generate a mean spectrum, perform peak picking and perform datacube reduction)
• Perform multivariate analysis (if data already reduced to peaks, load in memory. If data not reduced to peaks, then automatically select appropriate preprocessing and generate a mean spectrum, perform peak picking and perform datacube reduction)
• I'll decide later (opens default data window)

Browse images and perform multivariate analysis are largely the same, but browse images does not necessitate that the data is loaded into memory. All of these options could save out the processed data automatically to enable this step to be skipped during the next processing session.