Add CURRENCY and DATE/TIME as supported data types in the property manager

[furtonb]

As the title says. Current value definition supports the following entries:

- String

- Number

- Integer

- Length 

- Area

- Volume

- Angle

- Boolean

- Tags List

- Option set

I propose to extend with:

- CURRENCY (customizable format - e.g. a field could be a supplier price in EUR, then another property is a number for global exchange rates, then a third property is a local currency used for client communication)

- DATE (customizable format, for points in time, e.g. Planned start or end of activity)

- TIME (for intervals or measurable standard rates)

This would solve a lot of I/O problems with quantity take-offs and price estimates (current behaviour is: either you format the prices to be able to look at them nicely or you have the option to have them summed), as well as linking the model to project schedules.

Similar threads mentioning the issue: 

https://community.graphisoft.com/t5/Project-data-BIM/PROPERTIES-Issues-just-getting-started/td-p/587...

https://community.graphisoft.com/t5/Collaboration-with-other/Property-expressions-Add-or-substruct-m...

An extension could evolve into adding the option to define custom data types (with specific formats/units, e.g. base rate [EUR/h] * allocated time [h], where the allocated time is calculated based on a standard value and the element's respective geometrical size), then the expression editor could check the correctness in terms of units (see Wolfram Alpha for an example: https://www.wolframalpha.com/input?i=50+m2+*+(100+EUR%2Fm2+%2B+1.6+h%2Fm2+*+30+EUR%2Fh), it would be nice to have a checkbox on the UI to toggle each properties' unit to see where we might need to convert).

I'm curious about what you think.

Operating system used: Windows

[runxel]

I'd like to add a dedicated URL field.

So people can click on it. Like super basic stuff you'd expect from a computer.

(and that's not for web addresses alone – you could put references to files on your company's server there, even linking to a certain page of a PDF is possible! → file:///Users/yourname/documents/report.pdf#page=5)