Refactoring and flexibility changes

* Split game module into game and game_interface
* Move core_lib to corelib
* Move miniwindow to corelib
* Introduce init.lua script for initializing the client, giving much more flexibility
* OTClient is no longer Application derived and is much simpler

modules/corelib/math/color.lua

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+Color = {}

modules/corelib/math/math.lua

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+function math.round(num, idp)
+    local mult = 10^(idp or 0)
+    if num >= 0 then 
+    	return math.floor(num * mult + 0.5) / mult
+    else 
+    	return math.ceil(num * mult - 0.5) / mult
+    end
+end

modules/corelib/math/point.lua

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+Point = {}

modules/corelib/math/rect.lua

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+Rect = {}

modules/corelib/math/size.lua

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+Size = {}