cp: correctly copy mode, ownership, acl and context

Fix a mix-up between ownership and mode. The latter (mode / file permissions)
can also be set on windows (which however only affects the read-only flag),
while there doesn't seem to be a straight-forward way to change file ownership
on windows.

Copy the acl as well when copying the mode. This is a non-default feature and can be
enabled with --features feat_acl, because it doesn't seem to work on CI.
It is only available for unix so far.

Copy the SELinux context if possible.

.vscode/cspell.dictionaries/jargon.wordlist.txt

@@ -35,6 +35,7 @@ falsey
 fileio
 flamegraph
 fullblock
+getfacl
 gibi
 gibibytes
 glob
@@ -49,6 +50,7 @@ iflag
 iflags
 kibi
 kibibytes
+libacl
 lcase
 lossily
 mebi
@@ -91,6 +93,7 @@ seedable
 semver
 semiprime
 semiprimes
+setfacl
 shortcode
 shortcodes
 siginfo

.vscode/cspell.dictionaries/workspace.wordlist.txt

@@ -16,6 +16,7 @@ chrono
 conv
 corasick
 crossterm
+exacl
 filetime
 formatteriteminfo
 fsext