feat: Add the unreal2 protocol (#124)

* WIP: Add unreal2 protocol

* Add/Update badge

* protocols/unreal2: Update doc comments and TODOs

* protocols/unreal2: Don't pre-allocate as many bot players

* protocols/unreal2: Use "encoding-rs" for decoding unreal2 strings

* Add/Update badge

* protocols/unreal2: Add constants for player pre-allocation.

Also improve some doc comments and update PACKET_SIZE.

* protocols/unreal2: Early break when enough players have been parsed

Add a fast-path to avoid waiting for packet timeout when we have parsed
as many players as specified in the server info packet.

* protocols/unreal2: Use HashSet to store mutators

* protocols/unreal2: Handle server sending multiple values for a rule

* protocols/unreal2: Add GatheringSettings to control what to query

GatheringSettings allows skipping querying rules and/or players which
can make the query return much faster. This also required moving each
individual query into its own helper.

* protocols/unreal2: Add more derives to types

* protocols/unreal2: Simplify ServerInfo::parse()

Co-Authored-By: CosminPerRam <cosmin.p@live.com>

* Docs: Add unreal2 protocol documentation

I used a website to generate the markdown RESPONSES table, the save file
from this website is included to make updating the table easier in the
future.

https://www.tablesgenerator.com/markdown_tables

* Add/Update badge

* protocols/unreal2: Use the correct encoding for UCS2 strings

* Docs: Remove unnecessary TGN file

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Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: CosminPerRam <cosmin.p@live.com>

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