steamFrame.dashboard.windowCurvature: the "Toggle Curvature" row of a
window's More Options menu becomes a control (click: curved -> flat,
flat -> stock; drag up/down with the laser: curvature relative to
SteamVR's stock curve, snapping to 0 and 1). The patch moves each frame's
curvature-origin node to stock distance / value in outgoing scene graphs;
per-window values live in the systemui page. Lookups by signature
("window-curvature" in signatures.json, incl. check-only anchors).
Shared method hooks (lib/hooks.js, passed by mkPatch as 4th argument):
one SendMessage wrapper for dashboard-windows (now VERSION 3) and
window-curvature instead of a chain of per-patch wrappers; legacy
wrappers on top are unwound.
Pierre Kisters