Create relative pathes for saving projects

src/Tools/tim_tool/Cargo.lock

@@ -3150,6 +3150,12 @@ version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"
 
+[[package]]
+name = "pathdiff"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df94ce210e5bc13cb6651479fa48d14f601d9858cfe0467f43ae157023b938d3"
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.1"
@@ -4111,6 +4117,7 @@ dependencies = [
 name = "tim_tool"
 version = "0.1.0"
 dependencies = [
+ "pathdiff",
  "png",
  "rfd",
  "serde",