* util/options.cpp: Added option types for single and multiple paths.
* util/options.cpp: Substitute environment variables in values from defaults and INI files.
* ui/dirmenu.cpp: Removed hard-coded list of multi-path options.
* plugins: Don't substitute environment variables in path options.
* Fix console history path, homepath is a core option
* Create missing directories recursively in lua plugins.
* Add lfs to global environment in a less magical way.
require normally doesn't bind the name globally just returns the
module, mame sets a preloader that does bind lfs globally, but
maybe it's less surprising to do it explicitly
Made the sound manager mute controls readable, and got rid of system
enable since it just controls system mute anyway. This was causing
confusion: phantom2 was trying to use both independentlyt casuing the
mute bit to be ignored.
THe Lua interface changes are mostly changing methods to properties,
some renames to make things clearer, and some additional properties for
better control over snapshots.
