Should we depricate getAsDouble and similar methods

[r-englund]

The use of getAsDouble is a quite non-optimal way of accessing data and should be avoided.
I often see code where it is used as a primary way to access the data, often in loops.

Should we mark them as deprecated such that we can remove them in the future? The depreciation message could point to documentation on how to efficiently access data.

[PetiteViking]

I'm all for marking them as deprecated and pointing developers to a better way of doing it but I will also say that back when I first started off with Inviwo, those methods saved my life.

It's not the best way of doing things but these methods allow you to easily get things done when you just get into Inviwo. It's a steep learning curve and I feel like they offer some stepping stone.