Reimplement tree printing using 'ptree'

This patch reimplements the tree-printing using the 'ptree' crate.
Because ptree wants the tree item to implement `Clone`, a wrapper type is
added which then implements `Clone` and `ptree::TreeItem`

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 38157d2..d89f99f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -34,6 +34,7 @@ lazy_static    = "1.4"
 log            = "0.4"
 parse-display  = "0.4"
 pom            = "3"
+ptree          = "0.3"
 regex          = "1"
 reqwest        = { version = "0.10", features = [ "stream" ] }
 resiter        = "0.4"