rework ui related scripting stuff

data/modules/core/aliases.lua

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+-- some aliases
+loadUI = UI.load
+rootUI = UI.getRootContainer()
+

data/modules/core/core.lua

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+require 'aliases'
+require 'enums'
+require 'util'
+

data/modules/core/enums.lua

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+-- AnchorPoint
+AnchorNone = 0
+AnchorTop = 1
+AnchorBottom = 2
+AnchorLeft = 3
+AnchorRight = 4 
+AnchorVerticalCenter = 5
+AnchorHorizontalCenter = 6

data/modules/core/module.otml

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+title: Core
+notes: Core utilities used by other modules
+author: edubart
+version: 1
+website: https://github.com/edubart/otclient
+enabled: true
+script: core.lua
+

data/modules/core/util.lua

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+function createEmptyFunction()
+  local emptyFunction = function() end
+  return emptyFunction
+end
+