Dialog warning about transmitter end of life

[Navid200]

Currently, the transmitter days is highlighted on the system status page, for a G6, as the transmitter gets closer to end of life.
The color changes to red when it reaches 100, meaning you cannot start a sensor any longer.

I would like to also have a dialog come up informing the user how many more days they can continue to start sensors with their current transmitter.
This would only come up right before starting a sensor.

Such a warning would allow the user to plan how to time their last sensor if they choose to get as many days as possible from the transmitter. The warning also reminds the user that the transmitter is getting close to end of life and the user will know they need to plan to place an order for a new transmitter.

This PR is my attempt:
#2191

The problem with the PR is that it does not use the variables I used in this one: #2160

It also has a code duplication.

I need to address those and that's why I have set the PR to draft.

[Navid200]

A conversation has started in a related issue about the PR: #1486 (comment)

I suggest that we have the conversation here in this discussion.
If you have a suggestion for the PR, please let's have the conversation in the PR.

[Navid200]

This is my answer to the question about the sensor start time:

I have explained this here: https://navid200.github.io/xDrip/docs/Transmitter-lifetime

If session starts, it will complete.
So, if you start when it shows 99, it will end when it shows 109, which is the situation with my current session: