Addded OpionsItem

-Like MenuItem, but with the possibility of shwoing a value
-Will be used to set optins like Ball speed
-Will be set by clicking pluss/minus buttons above and under the value.
Added init for OptionItems

-Added function for intializing a OptionItem based on a string for
caption and a string for value.
-Created a new OptionItem, ballSpeedSetter that will hold the Ball speed
-Initalized ballSpeedSetter and added it to rendering function
Added code for rendering OptionItems in RenderTools

-Added code for rendering OptionItems
-Added separate function for rendering the pluss and minus above and
under the OptionItem
Removed copy of SDL_Rect in RenderTools

-Updated RenderTools::RenderMenuItem(..) so that it uses GetRectPtr() instead of making a copy of the SDL_Rect;
-Made GetRectPtr() const