tsk-194: Make distinction in MetadataQueue endpoints (#222)

* tsk-194: Moving metadata module

* tsk-194: Build fix

* tsk-194: Name changes

* tsk-194: Code formatting

* tsk-194: Version bump

* tsk-194: Test fixes

src/callers/mod.rs

@@ -1,11 +1,8 @@
 pub mod coverart;
-pub mod metadata;
 pub mod queue;
 pub mod song;
 
 pub mod endpoints {
-    pub const QUEUEMETADATA: &str = "/api/v2/song/metadata/queue";
-
     pub const CREATESONG: &str = "/api/v2/song";
     pub const GETSONGS: &str = "/api/v2/song";
     pub const GETALLSONGS: &str = "/api/v2/song/all";