[quicwg/base-drafts] loss recovery description mixes variables depending on the packet number space and packet numbers independent of it (#2405)

[Marten Seemann <[e-mail]>]

[Section 6.5.2](https://quicwg.org/base-drafts/draft-ietf-quic-recovery.html#rfc.section.6.5.2) lists the variables used by the loss recovery algorithm. 
Some of these variables are independent of the packet number space, e.g. `crypto_count`, `*rtt*.`
Other variables apply per packet number space, and we say so explicitly, e.g. `largest_acked_packet`.
Then there are a lot of variables that should be applied per packet number space, but we never say so explicitly, e.g. `sent_packets`, `loss_time`, etc.

The same applies to the pseudo code itself, for example `DetectLostPackets` uses both variables that only apply to one packet number space as well as variables that apply independent of the packet number space.

One way to resolve this would be to index the variables by their respective packet number space.

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