Slight rework of the tool toolbar

Been investigating various layouts that are more "future proof" for
additional tools.  I think I like this one; a horizontal row of tools
across the top, sorted by category (with title text), and all tool
options beneath.  This works well with translations, as all text has
room to grow horizontally as necessary.

This makes the bar a bit tall, but hopefully removing the permanent
progress bar balances out the vertical height requirement.
Do not load last-used height/width of certain toolbars

Instead, rely on their default values only.
Solve flickering-on-resize issues

Relates to #98.

I am starting to believe that VB natively implements a bunch of things
that should be handled via the API.

As an example, setting ClipControls on the main form causes all kinds of
trouble with child windows, while not reducing flicker in the least.  I
previously assumed that property just set a matching GW_STYLE flag of
WS_CLIPCHILDREN - but that is not the case!  Manually setting a
WS_CLIPCHILDREN style has fixed all my flicker issues, so VB must do
something else entirely.  Good to know...?