GroupVerify: Verification page, overrides and public Verified tags

Shown only where GroupVerify is: staff get the Verification page once its gv_* tables are in
the database, and the public site shows "Verified" only while it's on (enabled, with a group)
and not missing from css_plugins list, which the poller reads once a minute over RCON.

- Verification page: plugin state and version, Steam group, saved member list, overrides.
- Overrides (@zio/verify, not on yourself unless Root): give, change, remove; player drawer
  shows why a player is or isn't verified.
- Root sets the group and turns it on/off: saved to gv_settings, and sent as css_gv_* when the
  plugin is loaded so it applies at once.
- gv_* times use GroupVerify's own timezone setting.
- MySQL integration test (SAW_TEST_DSN), unit tests for plugin list parsing and the show rule.

internal/live/live_test.go

@@ -36,3 +36,27 @@ func TestParseErrors(t *testing.T) {
 		t.Fatal("output without end marker should be an error")
 	}
 }
+
+func TestParsePlugins(t *testing.T) {
+	out := `  List of all plugins currently loaded by CounterStrikeSharp: 3 plugins loaded.
+  [#1:LOADED]: "CS2-SimpleAdmin (RELEASE)" (1.8.2b-zio10) by daffyy
+    Simple admin plugin
+  [#2:LOADED]: "GroupVerify" (0.2.0) by astra
+    Verifies players by Steam group membership or a manual override
+  [#3:UNLOADED]: "NoGoZones" (0.14.0) by astra
+    Termination Reason: whatever
+`
+	loaded, ok := ParsePlugins(out)
+	if !ok {
+		t.Fatal("not recognised as a plugin list")
+	}
+	if loaded["GroupVerify"] != "0.2.0" || loaded["CS2-SimpleAdmin (RELEASE)"] != "1.8.2b-zio10" {
+		t.Fatalf("loaded %v", loaded)
+	}
+	if _, ok := loaded["NoGoZones"]; ok {
+		t.Fatal("unloaded plugins must not count as loaded")
+	}
+	if _, ok := ParsePlugins("Unknown command \"css_plugins\"\n"); ok {
+		t.Fatal("an error reply isn't a plugin list")
+	}
+}