frontend: Allow clicking the adjuster arrows on menu items. This allows
things like video options and DIP switches to be configured using a
mouse only. Also fixed a bug preventing paging menus with a mouse if
the first item scrolled off the bottom is not selectable.
debugger: Allow wplist and bplist to accept a CPU argument to list
breakpoints/watchpoints for a single CPU only.
debugger: Fixed some corner cases in address space syntax in memory
accesses, and allowed memory region accesses to use tags relative to the
visible CPU.
emu/softlist.cpp: Ignore notes elements when loading software lists.
It's effectively a comment that isn't a comment syntactically, it's
being used for things that are not useful to display in the internal UI,
and it slows down startup.
docs: Updated three more pages of debugger documentation. Also updated
more of the built-in debugger help.
minimaws: Fixed up schema for software list notes, made sofware list
notes display initially collapsed.
