See when the last manual watering event was performed

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As Kirstin I want to see when the last manual watering event was performed over the website to guess when I need to perform the next watering event.

AC I get a feeling of when I need to come back to the website to perform a new watering action.

UAT

• [x] Show an icon to make clear that the following text will show the last watering action
• [x] Show more that just the timestamp of the last watering action. Make it more tangible for the use. Which means show words like "recently" or minutes, hours, days or so.

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Tasks

• [x] Set up a feature toggle to enable the feature on test but not on production but do the integration test on the production page at the same time.
• [x] Set up a sub php file to catch the latest timestamp of the manual watering event and post this timestamp flat on the index page.
• [x] Check how long the last watering event has been passed and distinguish between minutes, hours and days by displaying these timestamp values.
• [x] Embed an icon to make the last watering event visually obvious.
• [x] Add the styling of the timestamp in the table to the main stylesheet file

Refactoring tasks

• [x] Create a overall php file that contains all the written texts in one file as constants to make overall changes more easy
• [x] Include the background color choice in a separate php file to call it in production and test to make color changes available in test and production immediately
• [x] Include the font color choice in a separate php file to call it in production and test to make the color changes available in test and production immediately
• [x] Change the current php calls to php function calls to simply return the value of the function based on input data
• [ ] Let the timestamp of the plantlog database table be defined by the database and not by the php insert statement

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Current result

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• [x] Show the specific date for watering events that lay longer then one week in the past from #82
• [x] Show the specific day for watering days that lay one week in the past from #81
• [x] If the measure of the moisture drops it should not increase again to avoid false alarm. Sure the moisture should increase after a watering event. Maybe we can use thresholds for increased moisture from #80 The idea here is that we later want to announce somewhere that the moisture dropped below a specific value and I want to avoid that the value was reset to a point where you cannot perform a watering action when you actually look at the message that told you to water the plant.

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Threshold like in #80 need to be increased.