Initial draft for experimental plugin implementation

[lbianchi-lbl]

Resolves (partially): #1085

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[lbianchi-lbl]

This is just an example at the moment, but here's how it looks like if we add an explicit check for PSUADE in sdoeSetupFrame.py:

The FOQUS interface starts as usual, but the SDoE frame won't be loaded. Eventually we'd also want the corresponding icon in the toolbar to be grayed out and/or display an error message/icon, but that require further work to move the code that loads the QAction for each frame from their current location in mainWindow.py to each plugin's module.

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
foqus_lib/gui/basic_data/basicDataParentFrame.py	72.00% <100.00%> (+5.33%)	⬆️
foqus_lib/gui/flowsheet/drawFlowsheet.py	60.39% <100.00%> (+1.16%)	⬆️
foqus_lib/gui/main/Dash.py	51.13% <100.00%> (+2.98%)	⬆️
foqus_lib/gui/main/settingsFrame.py	29.88% <100.00%> (+2.01%)	⬆️
foqus_lib/gui/optimization/optSetupFrame.py	55.55% <100.00%> (+1.04%)	⬆️
foqus_lib/gui/ouu/ouuSetupFrame.py	55.04% <100.00%> (+0.30%)	⬆️
foqus_lib/gui/sdoe/sdoeSetupFrame.py	31.36% <100.00%> (+0.12%)	⬆️
foqus_lib/gui/surrogate/surrogateFrame.py	51.20% <100.00%> (+0.89%)	⬆️
foqus_lib/gui/uq/uqSetupFrame.py	41.36% <100.00%> (+0.27%)	⬆️
setup.py	0.00% <ø> (ø)
... and 1 more

... and 3 files with indirect coverage changes

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