Adds an authentication system.

* The new Rust utility "webusers" manages /opt/libreqos/webusers.toml.
* You can add/update/remove/list users from that tool.
* The "allow anonymous" option in webusers.toml permits access for
  unauthenticated users, but won't let them change anything. This is
  for payne demonstrations.
* All web APIs and pages should now be secured, requiring a login.
* The login requires cookies.

Signed-off-by: Herbert Wolverson <herberticus@gmail.com>

.gitignore

@@ -48,6 +48,7 @@ src/tinsStats.json
 src/linux_tc.txt
 src/lastRun.txt
 src/liblqos_python.so
+src/webusers.toml
 
 # Ignore Rust build artifacts
 src/rust/target
@@ -57,6 +58,7 @@ src/bin/lqtop
 src/bin/xdp_iphash_to_cpu_cmdline
 src/bin/xdp_pping
 src/bin/lqos_node_manager
+src/bin/webusers
 src/bin/Rocket.toml