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littlefs/scripts
Christopher Haster 726bf86d21 Added dbgflags.py for easier flag debugging
dbgerr.py and dbgtag.py have proven to be incredibly useful for quick
debugging/introspection, so I figured why not have more of that.

My favorite part is being able to quickly see all flags set on an open
file handle:

  (gdb) p file.o.o.flags
  $2 = 24117517
  (gdb) !./scripts/dbgflags.py o 24117517
  LFS_O_WRONLY   0x00000001  Open a file as write only
  LFS_O_CREAT    0x00000004  Create a file if it does not exist
  LFS_O_EXCL     0x00000008  Fail if a file already exists
  LFS_O_DESYNC   0x00000100  Do not sync or recieve file updates
  LFS_o_REG      0x01000000  Type = regular-file
  LFS_o_UNFLUSH  0x00100000  File's data does not match disk
  LFS_o_UNSYNC   0x00200000  File's metadata does not match disk
  LFS_o_UNCREAT  0x00400000  File does not exist yet

The only concern is if dbgflags.py falls out-of-sync often, I suspect
flag encoding will have quite a bit more churn than flags/tags. But we
can always drop this script in the future if this turns into a problem.

---

While poking around this also ended up with a bunch of other small
changes:

- Added LFS_*_MODE masks for consistency with other "type<->flag
  embeddings"

- Added compat flag comments

- Adopted lowercase prefix for internal flags (LFS_o_ZOMBIE), though
  not sure if I'll keep this yet...

- Tweaked dbgerr.py to also match ERR_ prefixes and to ignore case
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