Add tree and pippi

[tGecko]

Add tree command, that can take in optional arguments to exclude directories or to include extensions.

Usage: %s <directory> [-e "directory_name1 directory_name2 ..."] [-i "ext1 ext2 ..."]
e.g.
tree /mnt/SDCARD/Roms/GB/ -e Imgs -i "7z zip gb"

Add pippi command, takes in data from stdin and prints it's FNV1A_Pippip_Yurii hash to stdout

/ # echo "Hello World" | pippi
4046137546

/ # cat /mnt/SDCARD/.tmp_update/runtime.sh | pippi
1734444258
/ #