move apis into rom/modules/main for shell compatibility

sys/modules/opus/ui/components/ActiveLayer.lua

@@ -0,0 +1,32 @@
+local class = require('opus.class')
+local UI    = require('opus.ui')
+
+UI.ActiveLayer = class(UI.Window)
+UI.ActiveLayer.defaults = {
+	UIElement = 'ActiveLayer',
+}
+function UI.ActiveLayer:layout()
+	UI.Window.layout(self)
+	if not self.canvas then
+		self.canvas = self:addLayer()
+	else
+		self.canvas:resize(self.width, self.height)
+	end
+end
+
+function UI.ActiveLayer:enable(...)
+	self.canvas:raise()
+	self.canvas:setVisible(true)
+	UI.Window.enable(self, ...)
+	if self.parent.transitionHint then
+		self:addTransition(self.parent.transitionHint)
+	end
+	self:focusFirst()
+end
+
+function UI.ActiveLayer:disable()
+	if self.canvas then
+		self.canvas:setVisible(false)
+	end
+	UI.Window.disable(self)
+end