Remove Backroll prefixes

[seanchen1991]

This PR renames the following:

• BackrollConfig to Config
• BackrollPlayer to Player
• BackrollPlayerHandle to PlayerHandle
• BackrollEvent to Event
• BackrollPeer to Peer
• BackrollPeerConfig to PeerConfig
• BackrollSync to Sync
• backroll::sync::Config to PlayerConfig
• bevy_backroll::BackrollStageCallbacks to StageCallbacks

To avoid naming conflicts in protocol/mod.rs, transport::Peer is namespaced as TransportPeer and protocol::Event is namespaced to ProtocolEvent.

I also took the liberty of addressing default clippy warnings.

Let me know if any of these changes aren't acceptable 🙂

[james7132]

Main question is if we should rename BackrollError or BackrollResult, everything else looks 👌.

[seanchen1991]

I don’t generally see crates name their internally-defined Error and Result types as such, as it could clash with the built-in Error and Result types, which is why I didn’t rename them.

[james7132]

Alright sounds good to me.