DriveSetup: fix creating partitions

The code paths for creating a new partition and editing an existing one
are more mixed together than I thought:

- CreateParametersPanel reuses a method from ChangeParametersPanel which
I had modified.
- In the storage kit, the code to create the parameter editor is also
shared between the two.

The problem is that when creating a partition, we have only the parent
BPartition. When modifying parameters, we have the child, and we need
to get some things from the child (the current parameters), and some
from the parent (the parameter editor).

Fixes #16859.

Change-Id: I5978386978c79a351e94c098c065fd43c422eb51
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3822
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

Fixes #9673

DriveSetup: Added support for changing partition parameters.

* Does not seem to work yet, though. The intel disk system should support it
now, but apparently the partition's delegate is not yet fully initialized
for whatever reason.

DriveSetup: solved a few issues of CreateParametersPanel.

* I obviously wasn't really done last time: now the panel behaves as it should.

DriveSetup: improved size slider.

* It uses size_for_string() to display all sizes which also fixes
using MiB for one, and MB for the other size string.
* It is no longer limited to 1M granularity by itself, but can have
arbitrary granularity as long as the number of possible values
remain smaller than 2^31.
* This means it can also handle values beyond 4TB now.
* The sizes that are set programmatically retain their full resolution.
* CreateParametersPanel still uses 1M granularity for now, though,
as we would otherwise need to be able to parse a size string with
a unit.

DriveSetup: fixed crash in CreateParametersPanel.

* Changed order of calling Init() vs. _CreateViewControls(). This
fixes bug #9422.
* The panel now hides (instead of disabling) the name or type control
if those aren't supported, anyway.

Minor cleanup.

* Reordred methods to their declaration order.

DriveSetup: renamed some files, fixed catalog.

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

Fixes #9673

DriveSetup: Added support for changing partition parameters.

* Does not seem to work yet, though. The intel disk system should support it
now, but apparently the partition's delegate is not yet fully initialized
for whatever reason.

DriveSetup: solved a few issues of CreateParametersPanel.

* I obviously wasn't really done last time: now the panel behaves as it should.

DriveSetup: improved size slider.

* It uses size_for_string() to display all sizes which also fixes
using MiB for one, and MB for the other size string.
* It is no longer limited to 1M granularity by itself, but can have
arbitrary granularity as long as the number of possible values
remain smaller than 2^31.
* This means it can also handle values beyond 4TB now.
* The sizes that are set programmatically retain their full resolution.
* CreateParametersPanel still uses 1M granularity for now, though,
as we would otherwise need to be able to parse a size string with
a unit.

DriveSetup: fixed crash in CreateParametersPanel.

* Changed order of calling Init() vs. _CreateViewControls(). This
fixes bug #9422.
* The panel now hides (instead of disabling) the name or type control
if those aren't supported, anyway.

Minor cleanup.

* Reordred methods to their declaration order.

DriveSetup: renamed some files, fixed catalog.

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