Support advanced automatic computation of import/export packages

[laeubi]

Currently one can add bundles to the "additional bundles" of the build.properties and then can chose that PDE adds missing items when launching a product or run config. This has several drawbacks:

1. It only adds items but never removes them if they become obsolete
2. It is actually quite hidden and most users don't know about how it works
3. As this is only performed at running a product this can lead to surprising effects
4. As it is a IDE only concern, Tycho can not really support this
5. Currently no version ranges are used, just a plain import

This could be much improved by adding a way to completely automate this for example with a checkbox like this:

If this is selected, the following should happen:

1. The part with RequireBundle is hidden
2. The part with Import-Package is disabled
3. The Part "Automated management" is extended to show with full size
4. The given additional bundles are used to compute the imported packages automatically and shown in the 'Import-Package' area

[HannesWell]

@laeubi I think we can consider this as resolved with the new project type for automated generated MANIFESTs?

[laeubi]

yep