Add EventRate as plot parameter for EventMonitor

Do not send GuiEvts in DataLoop but set dat attribute which is only read
by EventMonitor. This saves the generation of GuiEvts for ALL modules.

Update EventMonitor accordingly.

Currently we can only listen to ONE data src. This needs to be extended
in another branch before extending the plotter module

Unsolved: Subscription of notfications from ALL modules....

Change PlotParameter map key to ModuleId instead of ModuleEnquer

Add RemoveTrace to GraphBuffer

This handles time-based plot traces with history

Resolve "WavefrontOffset: Error in InterpolateGradientField"

Closes #190

See merge request wombat!29

Set default value of RefProps.MD5 to "wait4update". Don't know what I'm
doing here.

Resolve "AO Control: Static channel values not set"

Closes #189

See merge request wombat!28

new upstream shs_common. Init values of Gradient field 0 instead of NaN.

Closes #183

See merge request wombat!27

Resolve "AO Control: Use GUI update"

Closes #172

See merge request wombat!26

Resolve "Shearplate Simulator: crash if IOR < 0.7"

Closes #181

See merge request wombat!25

Add general error handler for ModuleBaseActor. In case of an error
within a module the error is displayed and only the module is closed
instea of the entire application.

Merge branch '132-shs-reference-calibrator-include-detection-of-rotation-in-manual-calibration' into 'development'

Resolve "SHS Reference Calibrator: Include detection of rotation in manual calibration"

Closes #132

See merge request wombat!24