More bug fixes for Spark skins for Halo components.
SDK-19660 - The focus for a halo CheckBox or RadioButton with a spark skin is not positioned correctly.
SDK-19603 - Button does not resize to fit icon
SDK-19560 - FxButton is 1px smaller in height than Button
SDK-19548 - Halo Button icons aren't vertically centerred correctly
QA/Doc Notes: A new style is added to Halo button: labelVerticalOffset. This style adjust the vertical position of the label relative to the rest of the Button content. It is only available when compatibility-version is >= 4. ASDoc has been added for this style.