Add anki21 format and fix multi import bug

Cargo.lock

@@ -2320,6 +2320,7 @@ dependencies = [
  "iced_core",
  "mimalloc",
  "rand",
+ "rayon",
  "reqwest",
  "rfd",
  "rhai",
@@ -2792,6 +2793,15 @@ dependencies = [
  "jni-sys 0.3.0",
 ]
 
+[[package]]
+name = "no-std-compat"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b93853da6d84c2e3c7d730d6473e8817692dd89be387eb01b94d7f108ecb5b8c"
+dependencies = [
+ "spin",
+]
+
 [[package]]
 name = "num-bigint"
 version = "0.4.6"
@@ -3995,6 +4005,7 @@ checksum = "dd4dd0f8c36625202a4ba553c416c19b719947cd2a31d1bda06126e4a5727daf"
 dependencies = [
  "ahash",
  "bitflags 2.10.0",
+ "no-std-compat",
  "num-traits",
  "once_cell",
  "rhai_codegen",
@@ -4591,6 +4602,12 @@ dependencies = [
  "x11rb",
 ]
 
+[[package]]
+name = "spin"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
+
 [[package]]
 name = "spirv"
 version = "0.3.0+sdk-1.3.268.0"