move heap functions to own mod

src/containers/bitmap.rs

@@ -1,6 +1,9 @@
 use crate::{
-    containers::ByteSlice, heap_clone, heap_drop, heap_move_nonnull,
-    heap_move_ok, heap_move_some, heap_remove,
+    containers::ByteSlice,
+    mem::{
+        heap_clone, heap_drop, heap_move_nonnull, heap_move_ok, heap_move_some,
+        heap_remove,
+    },
 };
 use servicepoint::{
     Bitmap, BitmapCommand, CompressionCode, DataRef, DisplayBitVec, Grid,

src/containers/bitvec.rs

@@ -1,6 +1,8 @@
 use crate::{
-    containers::ByteSlice, heap_clone, heap_drop, heap_move_nonnull,
-    heap_move_ok, heap_remove,
+    containers::ByteSlice,
+    mem::{
+        heap_clone, heap_drop, heap_move_nonnull, heap_move_ok, heap_remove,
+    },
 };
 use servicepoint::{
     BinaryOperation, BitVecCommand, CompressionCode, DisplayBitVec, Packet,

src/containers/brightness_grid.rs

@@ -1,6 +1,9 @@
 use crate::{
-    containers::ByteSlice, heap_clone, heap_drop, heap_move_nonnull,
-    heap_move_ok, heap_move_some, heap_remove,
+    containers::ByteSlice,
+    mem::{
+        heap_clone, heap_drop, heap_move_nonnull, heap_move_ok, heap_move_some,
+        heap_remove,
+    },
 };
 use servicepoint::{
     Brightness, BrightnessGrid, BrightnessGridCommand, ByteGrid, DataRef, Grid,

src/containers/char_grid.rs

@@ -1,6 +1,8 @@
 use crate::{
-    containers::ByteSlice, heap_clone, heap_drop, heap_move_nonnull,
-    heap_move_ok, heap_remove,
+    containers::ByteSlice,
+    mem::{
+        heap_clone, heap_drop, heap_move_nonnull, heap_move_ok, heap_remove,
+    },
 };
 use servicepoint::{CharGrid, CharGridCommand, Grid, Origin, Packet};
 use std::ptr::NonNull;

src/containers/cp437_grid.rs

@@ -1,6 +1,9 @@
 use crate::{
-    containers::ByteSlice, heap_clone, heap_drop, heap_move_nonnull,
-    heap_move_ok, heap_move_some, heap_remove,
+    containers::ByteSlice,
+    mem::{
+        heap_clone, heap_drop, heap_move_nonnull, heap_move_ok, heap_move_some,
+        heap_remove,
+    },
 };
 use servicepoint::{
     Cp437Grid, Cp437GridCommand, DataRef, Grid, Origin, Packet,