Reload data multiple output channels

[r-hannuschka]

Describe the bug
Multiple data load processes write to the same output channel which could be a mess.

To Reproduce
open 2 scripts and reload data for both of them

Expected behavior
Scripts should be have a different output channel so they dont mix up.

[r-hannuschka]

For the first we have created a workarround @see #486.

With the new load data button will be ensured there could be only 1 script loaded at the same time, so at this point it should be impossible run multiple data loads at the same time.

But this is no solution at the end because we want multiple load data at the same time.