cmd/tailscaled, safesocket: add --windows-mode=dev

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This adds a tailscaled string flag "--windows-mode" which accepts two
possible values: the empty string (default) to get the normal behavior
(tailscaled running as an admin, usually as a service), and "dev", to
make the safesocket named pipe path be at a location that regular
users (non-admins) can create.

It then modifies the safesocket client side (as used by the CLI) to
try the dev mode path too on failure.

This lets people work on tailscaled.exe+tailscale.exe in a terminal
easily during development, as either an admin or non-admin. (This
used to work prior to the move away from TCP localhost to named pipes
for safesocket on Windows)

Updates #2791

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Change-Id: I9c1e3a5b7d0f2a4c6e8b0d2f4a6c8e0b2d4f6a8c

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