VFS in external crate (#297)

* vroom

* Port dir middleware

* Filter rules

* Directory metadata

* Project support

* Enable Lua support

* StringValue support

* CSV

* rbxm, rbxmx, and rbxlx

* JSON models

* Clean up some warnings

* Strip out PathMap

* Unwatch paths when they're reported as removed

* Fix 'rojo upload' behavior

* Upgrade to Insta 0.13.1

* Update dependencies

* Release 0.6.0-alpha.2

* Fix bad merge

* Replace MemoryBackend with InMemoryFs

* Sledgehammer tests into passing for now

* Txt middleware

* Update easy snapshot tests

* Lua tests

* Project middleware tests

* Try to fix test failures by sorting

* Port first set of serve session tests

* Add InMemoryFs::raise_event

* Finish porting serve session tests

* Remove UI code for introspecting VFS for now

* VFS docs

src/snapshot_middleware/middleware.rs

@@ -1,23 +1,13 @@
-use rbx_dom_weak::{RbxId, RbxTree};
+use std::path::Path;
 
-use crate::{
-    snapshot::{InstanceContext, InstanceSnapshot},
-    vfs::{Vfs, VfsEntry, VfsFetcher, VfsSnapshot},
-};
+use vfs::Vfs;
+
+use crate::snapshot::{InstanceContext, InstanceSnapshot};
 
 use super::error::SnapshotError;
 
 pub type SnapshotInstanceResult = Result<Option<InstanceSnapshot>, SnapshotError>;
-pub type SnapshotFileResult = Option<(String, VfsSnapshot)>;
 
 pub trait SnapshotMiddleware {
-    fn from_vfs<F: VfsFetcher>(
-        context: &InstanceContext,
-        vfs: &Vfs<F>,
-        entry: &VfsEntry,
-    ) -> SnapshotInstanceResult;
-
-    fn from_instance(_tree: &RbxTree, _id: RbxId) -> SnapshotFileResult {
-        None
-    }
+    fn from_vfs(context: &InstanceContext, vfs: &Vfs, path: &Path) -> SnapshotInstanceResult;
 }