Update VTK
✔️ VTK 9.1 implemented
VTK_MAJOR_VERSION
VTK_MINOR_VERSION
MV_USE_VTKMFCWINDOW
vtkMFCWindow
Convert to Qt
🔲 Needs additional testing
Fix bugs related to CSUB (#20/#31)
❔ Still need feedback
Add ability to load concentration files (prudic2004)
✔️ partially implemented -- binary head or concentration files can now be loaded
lgr two flow models
modpath
Installer
❔ Lowest priority