Add option to give weights to parameterisation

[SBlokhuizen]

Adds some quality of life improvements to give the user more freedom in designing the desired boundary shape. You can now:

• Add weighting to the shape parameterisation, so NICE fits a specific of the shape more closely.
• Add weighted points on top of a parameterized shape, e.g. to pin the strike points.
• Edit weighted points directly on the plot, click to add, drag to move, select and backspace to delete.

Example weighting different regions

No weighting	Adding weighting to the top region	Weighting near x-point

Example Specifying strike points

Without strike points	With strike points

[ioan-alexandra]

small nitpick can the table be inside the container for extra points?