Newly introduced functionality aims to ease the creation of a VGA graph. For the preparation stage of VGA the process is to make a grid, fill the spaces of interest, make the graph and then add links. The pain point of researchers working with VGA though was that this process was irreversible, i.e. if one forgets to fill a space and makes the graph then there was no way to "unmake" it, fill up the missing space and then re-make it. To alleviate this a new function has been added (Tools -> Visibility -> Unmake visibility graph), which allows for exactly this reversal. Furthermore, the "linking" process has also been decoupled from the rest of the steps and now only requires that a point is filled. This means that linking can happen right at the same time as filling (before making the graph), or after making the graph.

Interface:
- Fixed the 3DView where the plan would not be displayed
- Allowed for opening a graph file by double clicking in macOS
- GLView: Allowed for multiple selection by pressing Shift and other minor fixes
- A DataMap with points now actually displays them in the GLVIew
- Actually calculate every isovist property if not in simple mode
- Fixed drawing layer tree
- Fixed polygon shape selection
- Made sure that a user can not add new columns if there is no map
- Made icon background transparent
- Changed the "Editable On" subitem into a column
- Fixed Edit -> Copy Screen
- Fixed a bug where the application would crash when making all-line-maps inside and outside plan
- The agent analysis does not output the trails to a file anymore but to a new DataMap

Importing:
- DXF: Fixed an issue where importing multiple dxfs would create odd artifacts at the layer manager
- DXF: Can now import ellipses and arcs properly
- Fixed mapinfo import
- Allowed polylines from mifs to be inserted as segments or axials

Command Line Interface (CLI) now allows:
- Importing DXFs and other types
- Exporting VGA links and connections and many more
- Defining the step depth type for each analysis
- Doing weighted and unweights segment analysis
- Converting maps (drawing to axial etc)
- Calculating step-depth

Other bugs:
- Salascript has been fixed and should now work as intended.


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