Revert "Appearance Prefs: Add scroll bar knob setting"

This reverts commit 0988f80fed032d45efed92734f9487daa55d4e09.

Change-Id: I60ec2b05a7c66e3c3c8f18dc821d6213934b0cfb

Appearance Prefs: Add scroll bar knob setting

Check values before setting them in SetFromScrollBarInfo

Pin arrow and knob settings to the top so they are aligned
Adjust vertical spacing on single/double to match knob style height

Only draw arrows on single/double FakeScrollBar

Change-Id: I6be89f86181a87808ba5201caf88a33c4414d4c8

Use be_control_look for BScrollBar and FakeScrollBar.

Remove all code which checks for be_control_look being NULL.

Also fix the DrawArrowShape method in be_control_look so the arrow is aligned,
as per the previous commit. In addition the code to offset the arrow when the
scroll button is pressed was unnecessary.

There is still some room for improvement, and I am not happy with the
BControlLook behavior here, as noted in some TODOs.

Remove the scroll bar knobs and corresponding setting

Variable name cleanup

Allow the user to select the scrollbar setting graphically.

This uses custom controls to allow the user to choose between
single and double arrows and none, dots, or line knob styles
in a graphical fashion copied from BeOS Scrollbar preflet.

Use be_control_look for BScrollBar and FakeScrollBar.

Remove all code which checks for be_control_look being NULL.

Also fix the DrawArrowShape method in be_control_look so the arrow is aligned,
as per the previous commit. In addition the code to offset the arrow when the
scroll button is pressed was unnecessary.

There is still some room for improvement, and I am not happy with the
BControlLook behavior here, as noted in some TODOs.

Remove the scroll bar knobs and corresponding setting

Variable name cleanup

Allow the user to select the scrollbar setting graphically.

This uses custom controls to allow the user to choose between
single and double arrows and none, dots, or line knob styles
in a graphical fashion copied from BeOS Scrollbar preflet.