advanced move safety check

Cargo.lock

@@ -148,6 +148,7 @@ dependencies = [
 name = "battlesnake"
 version = "1.0.0"
 dependencies = [
+ "enum-iterator",
  "env_logger",
  "log",
  "rand",
@@ -275,6 +276,26 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "enum-iterator"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c280b9e6b3ae19e152d8e31cf47f18389781e119d4013a2a2bb0180e5facc635"
+dependencies = [
+ "enum-iterator-derive",
+]
+
+[[package]]
+name = "enum-iterator-derive"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1ab991c1362ac86c61ab6f556cff143daa22e5a15e4e189df818b2fd19fe65b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "env_filter"
 version = "0.1.2"