add UNIQUE_PATH_DELIMITER to mount command

Added lz4 and zstd comporessions to squashfs.

Improve help output for --dd

travis: Update Python versions

Stop testing on unsupported Python 3.3

Drop Python 3.3 which isn't available anymore, add python 3.7 and 3.8 instead.

Make it clear that ext/cmd are optional and that the type can be a regular
expression.

Newest squashfs in upstream has supported LZ4 (5) and ZSTD
(6) as compression algorithms. However, they didn't exist in binwalk's
current magic library. This commit added the magic values so that squashfs images
compressed by these algorithms could be successfully identified.

Ref:
https://github.com/torvalds/linux/blob/master/fs/squashfs/squashfs_fs.h
https://github.com/file/file/blob/master/magic/Magdir/filesystems

Add signature/decryption support for PGP RSA encrypted session key

Added PKCS#7 Object signature

deps.sh: use new upstream cramfs-tools

Update binarch with AArch64 instructions

Remove conflicting signature for flattened device trees

make API example python3 compliant

Adding version into sdist

Fixed issue with next_target_file being unicode and causing an exception

Updated EXT signature to detect and skip to the end of the EXT image

`s/Not/not`

fix getting user's home dir

When running binwalk in non-interactive session some env variables
may not be set. This causes binwalk to fail to correctly determine
user's home directory. This commit fixes that (at least for linux systems).

Version 1.1 of cramfs does not build anymore with glibc 2.28 because
since this version glibc no longer includes <sys/sysmacros.h> from
<sys/types.h>, and therefore <sys/sysmacros.h> must be included
explicitly when major()/minor() are used.

To fix this issue, use new upstream project which includes
https://github.com/npitre/cramfs-tools/commit/434aabd67a39165ee0750c0e0d25213bf2ec8fa5

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>

Fixed file path bug in extractor.py where file names that are all digits were treated as integers rather than strings

Fixed some ROM signature and extraction bugs; added debug info during file open failures; updated plugins to use file.path instead of file.name