OO interface for Effects
OO fx interface: support params field
fix logging statement
replace lvalue subs with OO fx setter
eliminate lvalue object accessors
restore lvalue parent() subroutine
remove procedural effect accessors: bypassed(), owns(), type
remove procedural effect accessors: params(), chain()
fix error caused by $this_op = "ZZZZ"
replace procedural with OO calls
more OO style
OO style
move effect subs to ::Effect class,\
add AUTOLOAD so ::Effect object has access to registry fields
ecasound_effect_index is method
track_effect_index() as method

Conflicts:
	src/Effects.p
add registry_entry() method
remove fx() subroutine
rename method registry_entry() -> about()
quiet AUTOLOAD()
Merge branch 'oofx' into master (test-merge)