This adds benchmarks to track build time and build memory use
with dev and scu builds.
Dev and scu builds are what (regular) contributors will be running
most often, so it makes sense to benchmark them for targeted optimization.
`--quit-after` is not reliable in this scenario, requiring a value
as high as 12 to reliably import resources without crashing.
`--import` handles this in a more robust manner.
This provides a web interface generated with Hugo for tracking
benchmark results over time. Automatic dark theme support is
provided using water.css.
Benchmarks are run daily on a dedicated server with the `master` branch
of Godot compiled from source on that server, so that build time and
memory usage during the build can also be tracked over time.
Binary size as well as startup/shutdown time and memory usage
from an empty project are also measured.
