Restructured types to use a more flexible bit encoding

Recall that the 32-bit tag structure contains a 9-bit type. The type
structure then decomposes into a bit more information:
[---   9   ---]
[1|- 4 -|- 4 -]
 ^   ^     ^- specific type
 |   \------- subtype
 \----------- user bit

The main change is an observation from moving type info to the name tag
from the struct tag. Since we don't need the type info in the struct
tag, we can significantly simplify the type structure.

lfs.h

@@ -96,39 +96,29 @@ enum lfs_error {
 // File types
 enum lfs_type {
     // file types
-    LFS_TYPE_REG        = 0x008,
-    LFS_TYPE_DIR        = 0x010,
-    LFS_TYPE_SUPERBLOCK = 0x042,
-
-    // internally used entry structures
-    LFS_STRUCT_CTZ      = 0x001,
-    LFS_STRUCT_DIR      = 0x002,
-    LFS_STRUCT_INLINE   = 0x003,
-
-    LFS_STRUCT_NAME     = 0x041,
-    LFS_STRUCT_DELETE   = 0x047,
-
-    LFS_STRUCT_TAIL     = 0x081,
-    LFS_STRUCT_CRC      = 0x087,
-    LFS_STRUCT_IDELETE  = 0x0c1,
+    LFS_TYPE_REG        = 0x001,
+    LFS_TYPE_DIR        = 0x002,
 
     // internally used types
-    LFS_TYPE_SOFTTAIL   = 0x081,
-    LFS_TYPE_HARDTAIL   = 0x089,
-    LFS_TYPE_CRC        = 0x087,
-    LFS_TYPE_IDELETE    = 0x0c1,
+    LFS_TYPE_USER       = 0x100,
+    LFS_TYPE_SUPERBLOCK = 0x010,
+    LFS_TYPE_NAME       = 0x000,
+    LFS_TYPE_DELETE     = 0x03f,
+    LFS_TYPE_STRUCT     = 0x040,
+    LFS_TYPE_GLOBALS    = 0x080,
+    LFS_TYPE_TAIL       = 0x0c0,
+    LFS_TYPE_SOFTTAIL   = 0x0c0,
+    LFS_TYPE_HARDTAIL   = 0x0c1,
+    LFS_TYPE_CRC        = 0x0ff,
 
-    // internally used scopes
-    LFS_SCOPE_STRUCT    = 0x000,
-    LFS_SCOPE_ENTRY     = 0x040,
-    LFS_SCOPE_DIR       = 0x080,
-    LFS_SCOPE_FS        = 0x0c0,
-    LFS_SCOPE_USER      = 0x100,
+    LFS_STRUCT_INLINE   = 0x040,
+    LFS_STRUCT_CTZ      = 0x041,
+    LFS_STRUCT_DIR      = 0x042,
 
-    // internal sources
+    // internal chip sources
     LFS_FROM_REGION     = 0x000,
     LFS_FROM_DISK       = 0x200,
-    LFS_FROM_MOVE       = 0x03f,
+    LFS_FROM_MOVE       = 0x030,
 };
 
 // File open flags