Make some methods of SvgCanvas can be overridden, to improve text rendering of some apps and libraries.
- Methods:
  - getMultilineTextHeight
    - Inherited classes can adjust the value of lineHeight (adjust argument and call super).
  - getTextFontStyles
    - issue #1: CairoSVG, Inkscape, and some libraries can't understand font shorthand style property.
      - (Inkscape (v0.92.4) may understand partly)
    - Inherited classes can split font property to font-family, font-weight, font-size, ...
  - getTextAttributes
    - Firefox and Inkscape will render text justified if textLength is set.
      - Chromium and Safari don't justify in this case.
    - Inherited classes can adjust the value of textLength (adjust argument and call super).
- Issue:
  - #1 SvgCanvas: <text style="font: ..."> is not supported by some libraries

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