Canvas PUI mapping

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this will become a table with the most essential PUI directives (non-widgets), such as layout/styling and common PUI widget functionality (think live properties, bindings, conditions), so that we can keep track of what's missing/needed and finished already.

The basic idea can be seen below:

tag/directive	description	priority	progress	remarks
<property>, <format>	formats properties	high		working proof-of-concept
<enable>, <visible>	enables/disables and hides/shows widgets dynamically	high	n/a	still to be done
<font>	toggles default font for labels/buttons etc	low	n/a	not very difficult to do (see canvas font mapping example)
<color>	allows widget-specific colors to be overridden per widget	low	can be done via DefaultStyle.nas	not difficult, but also not very important either

• https://sourceforge.net/p/flightgear/fgdata/ci/next/tree/Docs/README.gui#l111
• https://sourceforge.net/p/flightgear/flightgear/ci/next/tree/src/GUI/FGPUIDialog.cxx#l1070

We will need to come up with some kind of "adapter" class that maps common PUI functionality to arbitrary Canvas widgets, specifically:

• <height> and <width>
• <legend> <label>
• <property> and <format>
• <binding>
• <default>
• <enable>
• <visible> (easy)
• <keynum> and <key>
• <font>
• <color>

Currently, this is accomplished in non-generic, fairly roundabout, fashion in the applyPUIAttributes() helper funciton in the pui2canvas parser