protocols: add xdg_toplevel_tag_v1 support

Adds a new windowrule to target windows by xdgTag, xdgtag:

src/desktop/Window.cpp

@@ -1808,3 +1808,17 @@ void CWindow::deactivateGroupMembers() {
 bool CWindow::isNotResponding() {
     return g_pANRManager->isNotResponding(m_pSelf.lock());
 }
+
+std::optional<std::string> CWindow::xdgTag() {
+    if (!m_pXDGSurface || !m_pXDGSurface->toplevel)
+        return std::nullopt;
+
+    return m_pXDGSurface->toplevel->m_toplevelTag;
+}
+
+std::optional<std::string> CWindow::xdgDescription() {
+    if (!m_pXDGSurface || !m_pXDGSurface->toplevel)
+        return std::nullopt;
+
+    return m_pXDGSurface->toplevel->m_toplevelDescription;
+}

src/desktop/Window.hpp

@@ -407,6 +407,8 @@ class CWindow {
     void                       setContentType(NContentType::eContentType contentType);
     void                       deactivateGroupMembers();
     bool                       isNotResponding();
+    std::optional<std::string> xdgTag();
+    std::optional<std::string> xdgDescription();
 
     CBox                       getWindowMainSurfaceBox() const {
         return {m_vRealPosition->value().x, m_vRealPosition->value().y, m_vRealSize->value().x, m_vRealSize->value().y};

src/desktop/WindowRule.hpp

@@ -37,7 +37,7 @@ class CWindowRule {
         RULE_WORKSPACE,
         RULE_PROP,
         RULE_CONTENT,
-        RULE_PERSISTENTSIZE,
+        RULE_PERSISTENTSIZE
     };
 
     eRuleType         ruleType = RULE_INVALID;
@@ -61,6 +61,7 @@ class CWindowRule {
     std::string       szOnWorkspace     = ""; // empty means any
     std::string       szWorkspace       = ""; // empty means any
     std::string       szContentType     = ""; // empty means any
+    std::string       szXdgTag          = ""; // empty means any
 
     // precompiled regexes
     CRuleRegexContainer rTitle;