emulator: get RPC working w/ Cargo features

emulator/Cargo.toml

@@ -7,6 +7,10 @@ edition = "2024"
 name = "dsa_rs"
 path = "src/lib.rs"
 
+[[bin]]
+name = "emulator"
+required-features = ["config"]
+
 [dependencies]
 common = { path = "../common" }
 assembler = { path = "../assembler" }
@@ -17,7 +21,8 @@ rfd = "0.15.3"
 dirs = "6.0.0"
 discord-presence = { version = "1.6.0", optional = true }
 toml = { version = "0.8.23", optional = true }
+serde = { version = "1.0.219", features = ["derive"], optional = true }
 
 [features]
 discord-rpc = ["dep:discord-presence"]
-config = ["dep:toml"]
+config = ["dep:toml", "dep:serde"]