QtPropertyBrowser: resizeToContent(), bold property text, read-only handling

[spacegaier]

• New method resizeToContet() to allow resizing to display as much content as possible to the user, while still having the option to set the overall resize mode to e.g. "QHeaderView::Interactive".
• Read-only functionality for enum property manager
• Bold text option for property

[spacegaier]

BTW: I am aware of the Qt Contribution Guidelines but have no time currently to work through that complex process (at least I remember it that way from last time I did a few years ago).
Thought I leave the PR here for now, incase someone else has a use for the proposed changes.

[Fishwaldo]

eh? Is this correct?

[CLAassistant]

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