feat: added Instrument Run Control

[AsCress]

Resolves #2446
Adds my first proposed feature, Instrument Run Control, to the Oscilloscope screen.

Instrument Run Control:

1. One of the most fundamental features which dedicated oscilloscope devices offer is the ability to Stop or Run the instrument.
2. When the oscilloscope is running, it is acquiring data from the activated channels when the triggering conditions are met. When stopped, it displays the last acquired waveform.
3. This allows for a detailed analysis of the instantaneously captured waveform.

The UI for the feature is implemented as a button in the Toolbar which can be used to toggle the state of the Oscilloscope.

Initially, the oscilloscope is running. Clicking the button would stop the acquisition of data and display the last captured waveform. Clicking the button again would start the capturing again, as shown in the video.

Changes

• app/src/main/java/io/pslab/activity/OscilloscopeActivity.java
• app/src/main/res/menu/activity_landscape_menu.xml
• app/src/main/res/values/strings.xml

Screenshots / Recordings

Screen_recording_20240531_161800.mp4

Note:- I have tested this feature with the In-Built-MIC input only.
@marcnause Could you please help me with testing this feature using all the other channels as well ?

Checklist:

• No hard coding: I have used resources from strings.xml, dimens.xml and colors.xml without hard coding any value.
• No end of file edits: No modifications done at end of resource files strings.xml, dimens.xml or colors.xml.
• Code reformatting: I have reformatted code and fixed indentation in every file included in this pull request.
• No extra space: My code does not contain any extra lines or extra spaces than the ones that are necessary.

[marcnause]

Please run Reformat Code (Ctrl + Alt + L) on app/src/main/java/io/pslab/activity/OscilloscopeActivity.java, there are two minor issues in the formatting.

Apart from that it looks good to me. I have tested with the in-build microphone of the phone and with the PSLab v5 hardware.

[AsCress]

@marcnause Thank you so much for testing and your comments! I've reformatted the code.