Dedicated result type for Event.probability()

[mdrie]

As documented here:

ich-kann-klima/src/events/EventsTypes.ts

Line 13 in 833ef85

* Three possible values-ranges and their meanings are

the method Event.probability() returns a number which may have 3 different meanings - making this longish documentation necessary in the first place...

A two-part return value is needed indicating with the first part if

• the event is currently not possible,
• may occur with a given probability, or
• has to occur with a given priority.

and with the second part the probability or priority.

This is probably not correct TS, but might illustrate the idea:

type EventProbability = "impossible"
                      | "possible" & { probability: 0..100 }
                      | "inevitable" & { priority: number }

Some nice generator functions for easy usage in the events would be helpful.

While doing this, the probability shall be changed from Ratio (i.e. value between 0 and 1) to Percent (0%..100%).