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Planned features and changes for Tobago 3.0

Todo:

- Bootstrap
- Simplify layout through using CSS3:
  - Use box-sizing: border-box (requires IE 8) (required for Bootstrap)
  - Use min/max-width/height (requires IE 9 (IE 8 have bugs (see caniuse.com)))
  - Use n-th child (requires IE 9 and FF 3.5)
  - Maybe: Using 75%,25% in HTML where columns="3*;*" in layout? What is with constant values?
  - Better: Using Flexible Box Layout Module (requires IE 10, might be emulated with JavaScript)
  - It seems to be required: Remove absolute Positioning (required for Bootstrap)

  - Renderervererbung: addClass() von Parent oder so? z.B. muss man be Bootstrap einem input wohl eine Klasse form-control hinzufügen

  - how to use: for best performance and responsive use tc:flexLayout instead of tc:gridLayout

  - consolidate LinkRenderer, ButtonRenderer with CommandRenderer

  - simplify: layout without facet and container (gridLayout, ... any other?):

  - make tx: lib deprecated, using tc: instead, that might be more intuitive for many users.

    <tx:in label="a" fieldId="b" id="c" />

    will be transformed to this

    <tc:in label="a" id="b or c" />  (if b is set use b otherwise use c)

    There is a little conflict between the "label" attribute used in the JSF spec. and the Tobago tx: label:
    Tobago means it should be displayed, and JSF spec. means that this should be used to display messages.
    In most cases there is no issue for that. But for the case that the application need a message label, but
    should not be displayed we need a new attribute:

    (preliminary) "labelPosition" or "labelLayout" with value "none"
    With this attribute we may advise the renderer also the position of the label.
    Or, using an attribute "renderLable"...

Done:

  - Removing tc:cell tag, please use tc:panel instead.

  - simplify (flowLayout, flexLayout, segmentLayout):

    <tc:flowLayout>
      ... content ...
    </tc:flowLayout>

    instead of

    <tc:panel>
      <f:facet name="layout">
        <tc:flowLayout/>
      </f:facet>
      ... content ...
    </tc:panel>

No longer supported:
* AbstractUIPage.getActionPosition()
* AbstractUIPage.setActionPosition()
* class Box
* class Dimension
* class Position
* ClientProperties.pageWidth
* ClientProperties.pageHeight
* tc:gridLayoutConstraint -> tc:style

if using tc:page state, width, height: remove it