Initialize window layout by composing components within one another from the root window component

[Keavon]

Now that all the component files are individually parsed into their own abstract syntax trees containing their subcomponents and attribute variable values, we have to put these all together into an actual GUI tree representing the whole window, essentially HTML's DOM. This needs to take into consideration the way in which data is passed down to children as props, and how that data will be reactively updated whenever the parent changes that data.

As of mid-February 2021, this is currently the GUI system's main blocking issue that requires some architectural design planning before approaching this further.

[Keavon]

Shelved on account of switching to a web app frontend for the short term.