Add ZIP archives support

I create this MR to have your help. There are some issues with the CI. Can you help me to correct them ?

mat2

@@ -67,29 +67,11 @@ def show_meta(filename: str):
         return
 
     print("[+] Metadata for %s:" % filename)
-    metadata = p.get_meta().items()
-    if not metadata:
-        print("  No metadata found")
-        return
-
-    for k, v in metadata:
-        zipmeta = v
-        zipmeta_name = v
+    for k, v in p.get_meta().items():
         try:  # FIXME this is ugly.
-            if not isinstance(zipmeta, dict):
-                print("  %s: %s" % (k, v))
+            print("  %s: %s" % (k, v))
         except UnicodeEncodeError:
-            print("  %s: harmful content" % zipmeta_name)
-    if mtype == "application/zip":
-        print("[+] Metadata for files inside the archive :")
-        if isinstance(zipmeta, dict):
-            for name, metas in zipmeta.items():
-                try:  # FIXME this is ugly.
-                    print("  %s" % name)
-                    for meta_name, meta in metas.items():
-                        print("    %s: %s" % (meta_name, meta))
-                except UnicodeEncodeError:
-                    print("  %s: harmful content" % zipmeta_name)
+            print("  %s: harmful content" % k)
 
 def clean_meta(filename: str, is_lightweight: bool, policy: UnknownMemberPolicy) -> bool:
     if not __check_file(filename, os.R_OK|os.W_OK):