Goodbye Lemur and other cruft, hello run-in-roblox-based testing

Cargo.toml

@@ -7,6 +7,11 @@ license = "MIT"
 repository = "https://github.com/rojo-rbx/rojo"
 edition = "2018"
 
+exclude = [
+    "/plugin/**",
+    "/test-projects/**",
+]
+
 [workspace]
 members = [
     "rojo-test",
@@ -50,4 +55,4 @@ lazy_static = "1.2"
 paste = "0.1"
 pretty_assertions = "0.6.1"
 tempfile = "3.0"
-walkdir = "2.1"
+walkdir = "2.1"