It is very common that you want to look for a snippet of text, rather than a text element that as a whole contains exactly what you look for; like when looking for a username on a page.

The current `browser.is_text_present` however only matches a text element 1:1. (and the documentation about this is not very clear that this is what is going on).

So if we have

```

Welcome, DeathSlayer!

Then `browser.is_text_present("DeathSlayer")` will return false, as will `browser.is_text_present("Welcome, DeathSlayer")` (because of the missing exclamation mark).

Could another command be introduced for this?