AUI-1718 Refactor funcionality into LayoutBuilderAddCol
AUI-1718 Adding attribute to disable adding cols via LayoutBuilder
AUI-1718 Refactor functionality into LayoutBuilderRemoveCol
AUI-1718 Adding attribute to disable removing cols via LayoutBuilder
AUI-1718 Refactor functionality into LayoutBuilderResizeCol
AUI-1718 Should be able to enable/disable each feature of LayoutBuilder