Merge bitcoin/bitcoin#21506: p2p, refactor: make NetPermissionFlags an enum class

7075f604e8 scripted-diff: update noban documentation in net_processing.cpp (Jon Atack)
a95540cf43 scripted-diff: rename NetPermissionFlags enumerators (Jon Atack)
810d0929c1 p2p, refactor: make NetPermissionFlags a uint32 enum class (Jon Atack)
7b55a94497 p2p: NetPermissions::HasFlag() pass flags param by value (Jon Atack)
91f6e6e6d1 scripted-diff: add NetPermissionFlags scopes where not already present (Jon Atack)

Pull request description:

  While reviewing #20196, I noticed the `NetPermissionFlags` enums are frequently called as if they were scoped, yet are still global. This patch upgrades `NetPermissionFlags` to a scoped class enum and updates the enumerator naming, similarly to #19771. See https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#enum-enumerations for more info.

  This change would eliminate the class of bugs like https://github.com/bitcoin/bitcoin/pull/20196#discussion_r610770148 and #21644, as only defined operations on the flags would compile.

ACKs for top commit:
  laanwj:
    Code review ACK 7075f604e8
  vasild:
    ACK 7075f604e8

Tree-SHA512: 7fcea66ee499f059efc78c934b5f729b3c8573fe304dee2c27c837c2f662b89324790568246d75b2a574cf9f059b42d3551d928996862f4358055eb43521e6f4

src/qt/rpcconsole.cpp

@@ -1062,7 +1062,7 @@ void RPCConsole::updateDetailWidget()
     ui->peerSubversion->setText(QString::fromStdString(stats->nodeStats.cleanSubVer));
     ui->peerConnectionType->setText(GUIUtil::ConnectionTypeToQString(stats->nodeStats.m_conn_type, /* prepend_direction */ true));
     ui->peerNetwork->setText(GUIUtil::NetworkToQString(stats->nodeStats.m_network));
-    if (stats->nodeStats.m_permissionFlags == PF_NONE) {
+    if (stats->nodeStats.m_permissionFlags == NetPermissionFlags::None) {
         ui->peerPermissions->setText(ts.na);
     } else {
         QStringList permissions;