Code cleanup on GuiReplayer.
Code cleanup in GuiHandViewer.

Also implement copy to clipboard context menu.
Code cleanup in Deck.
Actually change the config file in GuiPrefs.
Fix unicode error in GuiReplayer.
Update SWC converter for 'half' tables.
Fix GuiRingPlayerStats sorting problem.
Overhaul of Filters.

Mostly removing callbacks that duplicate control state to Filters
instance variables, and fixing state query functions to get it directly
from controls.
Also remove TourneyFilters completely.
Change symbol for SWC mBTC.

I am aware that this is pretty much bikeshedding.  The old symbol did
not display using the default Qt font in OSX.
Add config file info to about dialog.