Rename impl-generator-bin to impl-generator

This will start transitioning the impl generator to be a more generic helper tool, with the impl generator as one of its component.

Also, drop the "-bin" from the name, because what else is it going to be?

Makefile

@@ -1,7 +1,7 @@
 all:
 	xcodebuild -configuration Release
 	cp -r build/Release/Rust.bblm Contents/"Language Modules"
-	cd impl-generator; cargo build --release; cp target/release/impl-generator ../Contents/Resources/impl-generator-bin
+	cd helper-tool; cargo build --release; cp target/release/impl-generator ../Contents/Resources/impl-generator
 
 clean:
-	rm -r build
+	rm -r build; cd helper-tool; cargo clean

helper-tool/Cargo.lock

@@ -1,5 +1,5 @@
 [root]
-name = "impl-generator"
+name = "rust-bbedit-helpers"
 version = "0.1.0"
 dependencies = [
  "regex 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",

helper-tool/Cargo.toml

@@ -1,7 +1,12 @@
 [package]
-name = "impl-generator"
+name = "rust-bbedit-helpers"
 version = "0.1.0"
 authors = ["Ben S <ogham@bsago.me>"]
 
+[[bin]]
+name = "impl-generator"
+path = "src/impl-generator.rs"
+test = true
+
 [dependencies]
 regex = "*"