move apis into rom/modules/main for shell compatibility

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

@@ -0,0 +1,18 @@
+local class = require('opus.class')
+local UI    = require('opus.ui')
+
+local colors = _G.colors
+
+UI.VerticalMeter = class(UI.Window)
+UI.VerticalMeter.defaults = {
+	UIElement = 'VerticalMeter',
+	backgroundColor = colors.gray,
+	meterColor = colors.lime,
+	width = 1,
+	value = 0,
+}
+function UI.VerticalMeter:draw()
+	local height = self.height - math.ceil(self.value / 100 * self.height)
+	self:clear()
+	self:clearArea(1, height + 1, self.width, self.height, self.meterColor)
+end