Improve .gitignore to cover more cases.

This excludes anything rebuilderd might create alongside common Rust cruft.
Additionally, .vscode/ and .idea/ are ignored, since those are common editors.

Author: Nihlus

.gitignore

@@ -1,10 +1,35 @@
-/target
+### Rust ###
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
 **/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+## Common IDEs ###
+.idea/*
+.vscode/*
+
+### rebuilderd ###
 contrib/*.1
+
 rebuilder.key
 rebuilder.v2.key
-/worker/build/
-/worker/cache/
-/data/
-/secret/
-*.sw[op]
+
+rebuilderd.sign.key
+
+worker/build/
+worker/cache/
+
+data/
+secret/
+
+rebuilderd.db*