david/wechat-dump: Dump wechat messages from android

kopia lustrzana https://github.com/ppwwyyxx/wechat-dump.git

Yuxin Wu bb44745bb4 move common/ into wechat/		4 lat temu
..
libchat	5f93b39916 move libchat to legacy	4 lat temu
compatibility.sh	23b797b1f6 rewrite decryption logic	4 lat temu
decrypt-db.sh	ce84066d85 sqlcipher compatibilty	4 lat temu
libchathelper.py	bb44745bb4 move common/ into wechat/	4 lat temu