DriveSetup: improved default window size.

* The default width will no longer make the parameters and partition type
  columns visible.
* Fixed default size of those two columns -- I did not notice that the column
  state was being restored before, and thought it would just be another oddity
  of BColumnListView :-)
* Since MainWindow maintains its size pretty much itself, the constructor no
  longer gets a BRect.
* The window will now also be resized vertically to make space for all the
  partitions (only affects first launch without settings file).
* Also made the window a bit higher by default.
Fixed design issues in BPartitionParameterEditor.

* The user of an editor needed knowledge about the editor in order to make
  use of it.
* Furthermore, the BPartitionParameterEditor exposed type specific
  functionality that it shouldn't know anything about, either.
* We may now define a number of known parameters per editor type; right now
  there is only "type" as it's needed by DriveSetup.
* Adapted all disk systems, and DriveSetup to the new API.
* Renamed CreateParamsPanel, and InitializeParamsPanel to *ParametersPanel
  in DriveSetup.
* They now share a common base class AbstractParametersPanel.
DriveSetup: show content type if there is no type.
DriveSetup: renamed some files, fixed catalog.

* Already renamed the classes within those files earlier.
* The AbstractParametersPanel class was missing from the catalog.