Used `var variable := 0.0` as discussed in the Godot issue, instead of
`var variable: = 0.0`.
Mostly these are minor/cosmetic changes, but I've also reorganized the
folder structure (naming of folders) to reflect our guidelines, plus
made some minor changes to the demo codes. Still work in progress.
The use of multiline blocks in GDSCript for comments leaves them in the
final compiled file, increasing size and potentially processing for no
end-user gain.
