Brings in aarch64 host support (#152, #162, #167), natural scrolling (#163)
and the arm64 CI build job. Packaging, Pages and README keep the Nightcap
x86_64 side; upstream's aarch64 bundles are not published.
Records presents, GPU waits, submits, ETC2 decode, and pipeline and shader creation for ui.perfetto.dev. Adds a benchmark guide and a trace summary script.
vii