Fix issues plotter editor
Fixes all issues you mentioned in #154 (closed)
- The dataformat select by default shows the first available plotter dataformat as selected, but it should really show a "blank" selection, prompting the user to choose a dataformat
- The default value for (only bool-type?) parameters arent saved to the metadata
- There's no way to add libraries to the plotter!
I will let you review and accept this MR