Feature excel delete building blocks

[Etschbeijer]

closes #495

[Freymaurer]

The logic from removeSelectedAnnotationBlock seems overly complicated, are you sure this cannot be improved?

[Freymaurer]

I had some function which did something similiar. This will be important for another one of the quickaccess buttons. Add a parameter which toggles hide or unhide.

if true -> hide all reference columns
if false -> unhide all columns

[Etschbeijer]

fixed

[Etschbeijer]

@Freymaurer Somehow I cannot comment on your one comment so I do it that way:
I will look into it tomorrow.
The problem is that I have to catch the free text columns that are neither main nor property columns and I cannot utilize Arc Tables efficiently due to the difference in naming and index.