NIFSKOPE_VERSION and version comparison

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Currently the entire version string is compared with the version stored in the registry each time NifSkope is opened. This is done in NifSkope::migrateSettings() in order to clear stored settings when moving between versions. This was changed from having separate settings per version. (See #11) ^{I have updated the ticket there with more recent developments}

Going from 1.2.0a1.dev19 to 1.2.0a1.dev20, for example, will cause the UI to reset. This is annoying for testers. As I elaborated in #11 this is also completely unnecessary as it is only changes in Qt versions that need this reset.

The entire version string being the only thing available for comparison is definitely not ideal. Instead, the version string should be parsed and turned into an object which can be used for comparison, with configurable granularity.

For example:

    // Max of 7 parts:
    // 0 = Major
    // 1 = Minor
    // 2 = Revision
    // 3 = Stage Code (Alpha, Beta, RC, Final)
    // 4 = Stage Version
    // 5 = Dev Code (dev, post)
    // 6 = Dev Version

    auto ver3 = NifSkopeVersion( "1.2.0a1.dev19" );
    ver3.setNumParts( 3 );
    auto ver4 = NifSkopeVersion( "1.2.0a1.dev20" );
    ver4.setNumParts( 7 );
    auto ver5 = NifSkopeVersion( "1.2.0a1.dev20" );
    ver5.setNumParts( 3 );

    qDebug() << (ver3 == ver4);  // True
    qDebug() << (ver4 == ver3);  // False
    qDebug() << (ver5 == ver3);  // True

As you can see, ver5 and ver4 are the same except for their granularity.

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It would also be useful for displaying the version in a more human friendly way. A display version would be nice for the window title for example. (It currently says only "NifSkope")

Related

#11 Revert change which did separate registry settings per version
#12 Add a "Restore Defaults" function which clears stored settings