introduce startup options

* startup options with -help and -version
* many startup options for graphics

modules/game_healthbar/healthbar.lua

@@ -0,0 +1,59 @@
+HealthBar = {}
+
+-- private variables
+local healthBarWindow
+local healthBar
+local manaBar
+local healthLabel
+local manaLabel
+
+-- public functions
+function HealthBar.create()
+  healthBarWindow = displayUI('healthbar.otui', g_game.gameRightPanel)
+  healthBarButton = TopMenu.addGameButton('healthBarButton', 'Healh Bar', 'healthbar.png', HealthBar.toggle)
+  healthBarButton:setOn(true)
+  healthBar = healthBarWindow:getChildById('healthBar')
+  manaBar = healthBarWindow:getChildById('manaBar')
+  healthLabel = healthBarWindow:getChildById('healthLabel')
+  manaLabel = healthBarWindow:getChildById('manaLabel')
+end
+
+function HealthBar.destroy()
+  healthBarWindow:destroy()
+  healthBarWindow = nil
+  healthBarButton:destroy()
+  healthBarButton = nil
+  healthBar = nil
+  manaBar = nil
+  healthLabel = nil
+  manaLabel = nil
+end
+
+function HealthBar.toggle()
+  local visible = not healthBarWindow:isExplicitlyVisible()
+  healthBarWindow:setVisible(visible)
+  healthBarButton:setOn(visible)
+end
+
+-- hooked events
+function HealthBar.onHealthChange(localPlayer, health, maxHealth)
+  healthLabel:setText(health .. ' / ' .. maxHealth)
+  healthBar:setPercent(health / maxHealth * 100)
+end
+
+function HealthBar.onManaChange(localPlayer, mana, maxMana)
+  manaLabel:setText(mana .. ' / ' .. maxMana)
+
+  local percent
+  if maxMana == 0 then
+    percent = 100
+  else
+    percent = (mana * 100)/maxMana
+  end
+  manaBar:setPercent(percent)
+end
+
+connect(g_game, { onGameStart = HealthBar.create,
+                onGameEnd = HealthBar.destroy })
+connect(LocalPlayer, { onHealthChange = HealthBar.onHealthChange,
+                       onManaChange = HealthBar.onManaChange })