Add "next on monitor or empty" workspace parameter (#2198)

* Add "next on monitor or empty" workspace parameter

Implements the following workspace parameter:
r+x/r-x (i.e. r+1): Behaves similar to the "m" parameter, but can also
select empty workspaces and it doesn't wrap around

* Improve code comments

* Implementation V2 for 'r' workspace param

* Rebase to upstream

Should fix CI

* Always set outName

* Include named workspaces

Currently only considers open/active named workspaces

src/config/ConfigManager.cpp

@@ -2026,6 +2026,10 @@ std::string CConfigManager::getBoundMonitorStringForWS(const std::string& wsname
     return "";
 }
 
+const std::deque<SWorkspaceRule>& CConfigManager::getAllWorkspaceRules() {
+    return m_dWorkspaceRules;
+}
+
 void CConfigManager::addExecRule(const SExecRequestedRule& rule) {
     execRequestedRules.push_back(rule);
 }