Add support for StringValue instances

Closes #93.

server/src/rbx_session.rs

@@ -233,6 +233,7 @@ enum FileType {
     ModuleScript,
     ServerScript,
     ClientScript,
+    StringValue,
     LocalizationTable,
 }
 
@@ -256,6 +257,8 @@ fn classify_file(file: &ImfsFile) -> Option<(&str, FileType)> {
         Some((instance_name, FileType::ModuleScript))
     } else if let Some(instance_name) = get_trailing(file_name, ".csv") {
         Some((instance_name, FileType::LocalizationTable))
+    } else if let Some(instance_name) = get_trailing(file_name, ".txt") {
+        Some((instance_name, FileType::StringValue))
     } else {
         None
     }
@@ -339,6 +342,7 @@ fn snapshot_instances_from_imfs<'a>(
                 FileType::ModuleScript => "ModuleScript",
                 FileType::ServerScript => "Script",
                 FileType::ClientScript => "LocalScript",
+                FileType::StringValue => "StringValue",
                 FileType::LocalizationTable => "LocalizationTable",
             };
 
@@ -356,6 +360,11 @@ fn snapshot_instances_from_imfs<'a>(
                         value: contents.to_string(),
                     });
                 },
+                FileType::StringValue => {
+                    properties.insert(String::from("Value"), RbxValue::String {
+                        value: contents.to_string(),
+                    });
+                },
                 FileType::LocalizationTable => {
                     let entries: Vec<LocalizationEntryJson> = csv::Reader::from_reader(contents.as_bytes())
                         .deserialize()