Bug 1456

Most interesting ..

6a0ac90182efba40b0e6dab8f6390898aced70e8
GraphUI GridLayout: Functional Grid Layout w/ Padding, demo'ed in UISceneDemo20 with button Groups
    
    All layout magic is simply performed in Group.Layout.layout(..) @ validate, incl. updating the

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aca5b9b176f3c3393d8c7666a252488d44b18f2e
    GraphUI GridLayout: Also adjust potential bottom-left delta when centering shape to cell (like GlyphShape w/ underline)

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70d2b056e69562e83156d0435208be8124f2ff86
    GraphUI: Add BoxLayout and Margin, todo: Have GridLayout properly use Gap w/ Padding and alignment (Margin?) (CSS alike)

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a9c76153fd9a472679c1fc85189f6d4ecda7979e
    GraphUI Working GridLayout w/ and w/o cell-size and alignment; Added BoxLayout.

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8439522d73b60bcf61cc59550df6297bbafe73fb
    GraphUI Layout Alignment: Separate center alignment to horizontal and vertical

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ddd6cac8cc658ce542cb98e85f7d262f9917d37a

GraphUI Layout: Fix BoxLayout scale, margin and padding; Add same padding behavior to BoxLayout and GridLayout.

For all:
- Padding is applied to each {@Shape} via {@link Shape#setPaddding(Padding)} if passed in constructor
    
BoxLayout:
- Optionally centered {@link Alignment.Bit#CenterHoriz horizontally}, {@link Alignment.Bit#CenterVert vertically} or {@link Alignment#Center both}.
- Optionally scaled to cell-size if given and {@link Alignment#Fill}
- Margin is ignored on dimension with center {@link Alignment}
- Not implemented {@link Alignment}: Top, Right, Bottom, Left
    
GridLayout:
- Optionally centered {@link Alignment.Bit#CenterHoriz horizontally}, {@link Alignment.Bit#CenterVert vertically} or {@link Alignment#Center both}.
- Optionally scaled to cell-size if given and {@link Alignment#Fill}
- Without cell-size behaves like a grid bag using individual shape sizes including padding
- Can be filled in {@link Order#COLUMN} or {@link Order#ROW} major-order.
- Not implemented {@link Alignment}: Top, Right, Bottom, Left
    
Changes to Group.Layout interface:
- Added preValidate(Shape) allowing to prepare the shape before validation, used to inject Padding
    
Changes to Margin:
- Removed the complex CENTER property and using Alignment in BoxLayout as well
    
Changes to BoxLayout:
- Using Alignment
    
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Tested via UILayoutBox01 and UILayoutGrid01,
try the tooltip by clicking on the group's description label.

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e5de90b67efe8e8ca518159b3a73295d751764c1
GraphUI BoxLayout: Margin is only ignored for center Alignment w/o Fill scale. {Box,Grid}Layout: Always remove Bottom-Left delta a
nd refine API doc of  incl scale behavior

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e676a65eac2bfa2abbfcd346492868ed17dc4667
    GraphUI Layout (Box/Grid): Adjust bottom-left offset according to center-axis


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