Missing tandems for Text/RichText elements

[pixelzoom]

For phetsims/qa#889

Reviewing #312 resulted in me identifying some Text/RichText elements that are not instrumented, along with a couple of other misc. things.

The tandems that I believe are missing are:

Text elements:

• concentrationScreen.view.saturatedIndicator (SaturatedIndicator.ts)
• concentrationScreen.view.saturatedIndicator.text (SaturatedIndicator.ts)
• simPreferences.showSolutionVolumeCheckbox.text (BLLPreferencesNode.ts)
• simPreferences.showSoluteAmountCheckbox.text (BLLPreferencesNode.ts)
• simPreferences.beakerUnitsControl.radioButtonGroup.litersRadioButton.text (BeakerUnitlsControl.ts)
• simPreferences.beakerUnitsControl.radioButtonGroup.millilitersRadioButton.text (BeakerUnitlsControl.ts)
• simPreferences.concentrationMeterUnitsControl.radioButtonGroup.molesPerLiterRadioButton.text (ConcentrationMeterUnitsControl.ts)
• simPreferences.concentrationMeterUnitsControl.radioButtonGroup.percentRadioButton.text (ConcentrationMeterUnitsControl.ts)

I'd like to confirm with @arouinfar before I instrument these.

[pixelzoom]

Confirmed with @arouinfar that the above need to be instrumented.

These do NOT need to be instrumented:

• beersLawScreen.view.solutionPanel.solutionComboBox.listBox.*.text
• concentrationScreen.view.solutePanel.soluteComboBox.listBox.*.text

[pixelzoom]

These:

RichText elements:

• concentrationScreen.view.solutePanel.soluteFormRadioButtonGroup.solidRadioButton.text (SolutionControl.ts)
• concentrationScreen.view.solutePanel.soluteFormRadioButtonGroup.solutionRadioButton.text (SolutionControl.ts)

... turned out to be instrumented, but incorrectly named. I changed the tandem name from 'labelText' to 'text', to match the pattern used for other radio buttons.

[pixelzoom]

Over to @arouinfar to review. Let me know if you want to feature any of these. Feel free to close if no further changes are needed.

[arouinfar]

Thanks @pixelzoom. Everything looks good in master. The contents of general.model.strings.beersLawLab are featured by default. Since these new instances of text all have children linking back to the StringProperty, they'll show up in the tree when viewing featured elements. No need to feature the text itself.

[pixelzoom]

Reopening to confirm that these changes made it into 1.7 release branch.

@samreid @matthew-blackman FYI.

[pixelzoom]

Confirmed that this change is present in 1.7. Closing.