With the new changes coming in the MutationObserver branch; we discovered the title of the Youbube page is always the same as the title of the page and instead of doing an expensive call to the document with a query selector for the title of the video which is a nested DOM element we can use the document title.
The MutationObserver branch also makes all the lyric logic depend on the change in the title of the web-page; coupled with this change there is a nice symmetry between the two main components of the extension; being the tab change detection logic and the lyric fetching and injection.
Since this change is meant to go with the MutationObserver change, it is
guaranteed that the title of the of document will exist and hence we can remove
the dependency on awaitElement/document.querySelector
With this change the only call to the document.querySelector function is in
the tag parser and since we use the utility function awaitElement as
a wrapper to make sure we don't fail the querySelector call before the element
is rendered. We can slowly phase out the awaitElement utility. The tag
parser is currently not used in hopes to be used as a fall-back for the title parser at a later stage but it needs a big overhaul.
The title regex now has to account for a - YouTube suffix in the title which
is easily dealt with, by adding a new group and capturing that part out.