This includes:
* Allowing the details area to scroll should the parent dialog not be long enough.
* Scaling all displayed sprites to 144x144 while maintaining aspect ratio.
* Forcing extra width so all mainline unit names have enough space to appear.
* Removing the unused 'minimal' definition. Might be added back later.
* Fixing the borders. The internal widgets shouldn't have outside borders, since borders
should be set for the widget instance in a containing dialog.
This also adds the necessary changes to said widget to allow single-unit stats display.
It still needs to be expanded somewhat. Right now it contains the minimum required for
the attack dialog.
There seems to possibly be an internal issue with the slider (and more generally, the
scrollbar implementation form which it inherits) where is min/maximum_positioner_length
equal an even number, sliders with an even number of options will reach max value.
Setting it to what, in this case is 1 below the actual width of the slider image (15)
means both even and odd-numbered sliders will reach max value, however the edge is cut off.
Attempting to set the right_offset to 1 and using the above off value for the positioned
width means only sliders with an odd number of options reach max value.
The magic numbers in this commit seem to give the widget enough space to reach the end of
the slider and max values regardless of the number of options, but the internal widget dimension
calculation should perhaps be investigated in the future.
remove hardcoded path for logo image
add 'game_logo' & 'game_logo_background' keys in [game_config]
this allows [core] authors to define their own game logo to appear on the title screen
this does not (yet) affect the loadscreen
New dialog added to advanced preferences. It contains toggles to
activate and deactivate logging (log messages print to console). Also
added a getter method to the base log methods so that the dialog can
'remember' previous choices.
