7464: remove MyHtmlIslandImpl
7464: _htmlIsland

just refactor
7464:  UIHtmlBox

ctor revisit
7466: HtmlRenderBox ctor revisit
7467:move Image and TextContentManager
Merge branch 'v_retro01' into v_html_layer

Conflicts:
	Source/HtmlRenderer.Demo/HtmlRenderer.WinFormControls/HtmlPanel.cs

Source/HtmlRenderer.Demo/HtmlRenderer.WinFormControls/Platform/WinHtmlRo
otVisualBoxExtension.cs
	Source/LayoutFarm.Composers.WinForms/TopBox/MyRootGraphic.cs
	Source/LayoutFarm.Composers/7_BridgeHtmlRenderer/HtmlRenderBox.cs
	Source/LayoutFarm.Composers/7_BridgeHtmlRenderer/MyHtmlIsland.cs

Source/LayoutFarm.Composers/7_BridgeHtmlRenderer/WinHtmlRootVisualBoxExt
ension.cs
	Source/LayoutFarm.HtmlRenderer/2_Boxes/3_Layout/LayoutVisitor.cs
	Source/LayoutFarm.YourCustomUI/UIHtmlBox/UIHtmlBox.cs