Add fs command "FS_CMD_LIST"
Add the marco of the limit of entries of the list
cat: Modify incorrect reference of strlen.
Increase the size of the stack
file.c: Create list_files() to get the file list
Create "ls" command for file listing
path.c: Create new case PATH_CMD_LIST for sending request to romfs
romfs.c: Add romfs_listFiles() which returns the file list of requested directory
romfs.c: Create new case FS_CMD_LIST which return the list to the requesting task