Chart Font sidebar panelHEADmaster

Added font panel for chart text based elements:
Title, Label , Legends, Axis.

Font sidebar updated based on the selected chart element properties.
Clicking on the font sidebar will change the properties of the
selected chart element. (Bold, italic ...)

1 title can have multiple Font settings, the sidebar will display
a values only if the whole title havbe the same value.
Setting a value will set it for the whole title at once.

If a Title is edited, then the font panel is disabled now, because
it need an other implementation, to set textEdit attributes,
and to update the font panel based on the attributes.
Added 2 //Todo: where it could (started to) be implemented.

Added 3 new Context to EnumContext:
- ChartLabel
- ChartLegend
- ChartTitle
This is a bit risky because what was previously only a Chart, now
may be not a Chart value, but instead 1 of the 3.
refactored those parts where i seen it could be a problem,
i hope i not left out something.
(Axis was already made by someone)

Change-Id: I19eaeb93332a08faae6ed21e7e81a9ea56a4495b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/185023
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

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