Support for matrix-inverted-already attribute in GatingML

[krcurtis]

Is your feature request related to a problem? Please describe. FlowKit does not appear to use the matrix-inverted-already flag in GatingML

Describe the solution you'd like It would be nice if FlowKit could use an already inverted matrix. For example, the DIVA vendor specific XML files already include a compensation matrix, but it appears to be already inverted. I'd like to use their matrix as-is without going thru a matrix inversion to avoid adding more noise.

Describe alternatives you've considered I can invert the matrix found in DIVA vendor specific files and not use the matrix-inverted-already flag when generating GatingML files to use with FlowKit

Additional context