Protobufs for steam-vent

Sourced from https://github.com/SteamDatabase/Protobufs

Updating generated code

• cd build
• cargo r -- ../steam/{protos,src/generated}
• cargo r -- ../tf2/{protos,src/generated}
• cargo r -- ../csgo/{protos,src/generated}
• cargo r -- ../dota2/{protos,src/generated}

Using custom protobufs

If you need to use protobufs that aren't packages by steam-vent, you can create a new package for the protobufs using the following steps:

1. Create a new crate

2. Add steam-vent-proto-common as a dependency

3. Place the protobufs in src/protos

4. Create an empty src/generated folder

5. Either install steam-vent-proto-build trough cargo-install or clone this repo and build it from the build directory.

6. Run steam-vent-proto-build path/to/src/protos path/to/src/generated

7. Create src/lib.rs with the following contents:

   mod generated;
   
   pub use generated::*;