Re-factor the imputation and PRS analysis

[Nicklas Nordborg]

See #1601.

The imputation analysis should be re-factored so that it create new child items instead of just attaching files to the OncoArray items.

A new subtype ImputedGenotypes with suffix .i should be defined. Annotations are re-assigned as needed.

The PRS analysis may need some minor changes but it should be enough to just attach the result file and score to the ImputedGenotypes item.

[Nicklas Nordborg]

In 7787:

References #1602: Re-factor the imputation and PRS analysis

Added ImputedGenotypes subtype.

[Nicklas Nordborg]

In 7788:

References #1602: Re-factor the imputation and PRS analysis

Updated the imputation pipeline so that it create ImputedGenotypes child items. The script need to be modified so that we get the correct name in the resulting VCF files.

[Nicklas Nordborg]

In 7789:

References #1602: Re-factor the imputation and PRS analysis

Updated the PRS calculation.

[Nicklas Nordborg]

In 7790:

References #1602: Re-factor the imputation and PRS analysis

Removed things that are no longer needed.

[Nicklas Nordborg]

In 7791:

References #1602: Re-factor the imputation and PRS analysis

Added ImputationRefPanel annotation so that we can store the which reference panel that was used for the imputation. The only value so far is Phase3_hg38.

[Nicklas Nordborg]

In 7792:

References #1602: Re-factor the imputation and PRS analysis

Added a "Imputed genotypes" section in the case summary.