remove colon syntax from oop

sim/group.lua

@@ -1,6 +1,7 @@
+
 Group = {}
 
-function Group:new()
+function Group.new(self)
 	local o = {
 		state = false,
 		fxstate = false,
@@ -18,11 +19,11 @@ function Group:new()
 	return o
 end
 
-function Group:getsize()
+function Group.getsize(self)
 	return self.nwires + self.nout_ports + self.nin_ports
 end
 
-function Group:addwire(wire)
+function Group.addwire(self, wire)
 	if wire.group ~= self then
 		if wire.group ~= nil then
 			self:mergewith(wire.group)
@@ -37,7 +38,7 @@ function Group:addwire(wire)
 	end
 end
 
-function Group:removewire(wire)
+function Group.removewire(self, wire)
 	wire.group = nil
 	self.wires[wire] = nil
 
@@ -74,7 +75,7 @@ function Group:removewire(wire)
 	self.nin_ports = 0
 end
 
-function Group:addport(port)
+function Group.addport(self, port)
 	port.group = self
 
 	if port.type == PortTypes.output then
@@ -88,7 +89,7 @@ function Group:addport(port)
 	end
 end
 
-function Group:removeport(port)
+function Group.removeport(self, port)
 	if port.type == PortTypes.output then
 		self.out_ports[port] = nil
 		self.nout_ports = self.nout_ports - 1
@@ -97,31 +98,31 @@ function Group:removeport(port)
 		self.nin_ports = self.nin_ports - 1
 	end
 
-	sim:queuegroup(self)
+	Simulation.queuegroup(sim, self)
 end
 
-function Group:mergewith(group)
+function Group.mergewith(self, group)
 	if self:getsize() >= group:getsize() then
-		group:mergeinto(self)
+		Group.mergeinto(group, self)
 		return self
 	else
-		self:mergeinto(group)
+		Group.mergeinto(self, group)
 		return group
 	end
 end
 
-function Group:mergeinto(group)
+function Group.mergeinto(self, group)
 	for k, wire in pairs(self.wires) do
 		wire.group = nil
-		group:addwire(wire)
+		Group.addwire(group, wire)
 	end
 
 	for k, port in pairs(self.out_ports) do
-		group:addport(port)
+		Group.addport(group, port)
 	end
 
 	for k, port in pairs(self.in_ports) do
-		group:addport(port)
+		Group.addport(group, port)
 	end
 
 	self.wires = {}
@@ -133,15 +134,15 @@ function Group:mergeinto(group)
 	self.nin_ports = 0
 end
 
-function Group:setstate(state)
+function Group.setstate(self, state)
 	if state ~= self.state then
 		self.state = state
 		self.updatetick = sim.currenttick
 
 		for k, port in pairs(self.in_ports) do
-			port:setinputstate(state)
+			Port.setinputstate(port, state)
 		end
 
-		sim:queuegroupfx(self)
+		Simulation.queuegroupfx(sim, self)
 	end
 end