Rearranged tag encodings to make space for BECKSUM, ORPHAN, etc

Also:

- Renamed GSTATE -> GDELTA for gdelta tags. GSTATE tags added as
  separate in-device flags. The GSTATE tags were already serving
  this dual purpose.

- Renamed BSHRUB* -> SHRUB when the tag is not necessarily operating
  on a file bshrub.

- Renamed TRUNK -> BSHRUB

The tag encoding space now has a couple funky holes:

- 0x0005 - Hole for aligning config tags.

  I guess this could be used for OCOMPATFLAGS in the future?

- 0x0203 - Hole so that ORPHAN can be a 1-bit difference from REG. This
  could be after BOOKMARK, but having a bit to differentiate littlefs
  specific file types (BOOKMARK, ORPHAN) from normal file types (REG,
  DIR) is nice.

  I guess this could be used for SYMLINK if we ever want symlinks in the
  future?

- 0x0314-0x0318 - Hole so that the mdir related tags (MROOT, MDIR,
  MTREE) are nicely aligned.

  This is probably a good place for file-related tags to go in the
  future (BECKSUM, CID, COMPR), but we only have two slots, so will
  probably run out pretty quickly.

- 0x3028 - Hole so that all btree related tags (BTREE, BRANCH, MTREE)
  share a common lower bit-pattern.

  I guess this could be used for MSHRUB if we ever want mshrubs in the
  future?

scripts/dbgbmap.py

@@ -26,22 +26,22 @@ TAG_STAGLIMIT       = 0x000e
 TAG_SATTRLIMIT      = 0x000f
 TAG_MDIRLIMIT       = 0x0010
 TAG_MTREELIMIT      = 0x0011
-TAG_GSTATE          = 0x0100
-TAG_GRM             = 0x0100
+TAG_GDELTA          = 0x0100
+TAG_GRMDELTA        = 0x0100
 TAG_NAME            = 0x0200
-TAG_BOOKMARK        = 0x0201
-TAG_REG             = 0x0202
-TAG_DIR             = 0x0203
+TAG_REG             = 0x0201
+TAG_DIR             = 0x0202
+TAG_BOOKMARK        = 0x0204
 TAG_STRUCT          = 0x0300
 TAG_DATA            = 0x0300
-TAG_TRUNK           = 0x0304
-TAG_BLOCK           = 0x0308
+TAG_BLOCK           = 0x0304
+TAG_BSHRUB          = 0x0308
 TAG_BTREE           = 0x030c
+TAG_DID             = 0x0310
 TAG_BRANCH          = 0x031c
-TAG_MDIR            = 0x0321
-TAG_MTREE           = 0x0324
-TAG_MROOT           = 0x0329
-TAG_DID             = 0x032c
+TAG_MROOT           = 0x0321
+TAG_MDIR            = 0x0325
+TAG_MTREE           = 0x032c
 TAG_UATTR           = 0x0400
 TAG_SATTR           = 0x0600
 TAG_SHRUB           = 0x1000