Re-added "Don't stretch/shrink" option

Closes #345

modules/client_options/graphics.otui

@@ -40,13 +40,17 @@ Panel
     !text: tr('Fullscreen')
     tooltip: Ctrl+Shift+F
     
+  OptionCheckBox
+    id: dontStretchShrink
+    !text: tr('Don\'t stretch/shrink Game Window')  
+
   Label
     id: backgroundFrameRateLabel
     !text: tr('Game framerate limit: %s', 'max')
     anchors.left: parent.left
     anchors.right: parent.right
     anchors.top: prev.bottom
-    margin-top: 6
+    margin-top: 12
     @onSetup: |
       local value = modules.client_options.getOption('backgroundFrameRate')
       local text = value

modules/client_options/options.lua

@@ -25,7 +25,8 @@ local defaultOptions = {
   ambientLight = 25,
   displayNames = true,
   displayHealth = true,
-  displayText = true
+  displayText = true,
+  dontStretchShrink = false
 }
 
 local optionsWindow
@@ -223,6 +224,10 @@ function setOption(key, value, force)
     gameMapPanel:setDrawHealthBars(value)
   elseif key == 'displayText' then
     gameMapPanel:setDrawTexts(value)
+  elseif key == 'dontStretchShrink' then
+    addEvent(function()
+      modules.game_interface.updateStretchShrink()
+    end)
   end
 
   -- change value for keybind updates