feat: global menu

This adds a global menu to NeoChat, providing
a standard and consistent set of File/Edit/View/so on
menus.

imports/NeoChat/Menu/EditMenu.qml

@@ -0,0 +1,90 @@
+// SPDX-FileCopyrightText: 2021 Carson Black <uhhadd@gmail.com>
+// SPDX-License-Identifier: LGPL-2.0-or-later
+
+import Qt.labs.platform 1.1 as Labs
+import QtQuick 2.15
+import QtQuick.Controls 2.12 as QQC2
+import QtQuick.Layouts 1.10
+import org.kde.kirigami 2.15 as Kirigami
+
+Labs.Menu {
+    id: editMenu
+
+    required property Item field
+
+    Labs.MenuItem {
+        enabled: editMenu.field !== null && editMenu.field.canUndo
+        text: i18nc("text editing menu action", "Undo")
+        shortcut: StandardKey.Undo
+        onTriggered: {
+            editMenu.field.undo()
+            editMenu.close()
+        }
+    }
+
+    Labs.MenuItem {
+        enabled: editMenu.field !== null && editMenu.field.canRedo
+        text: i18nc("text editing menu action", "Redo")
+        shortcut: StandardKey.Redo
+        onTriggered: {
+            editMenu.field.undo()
+            editMenu.close()
+        }
+    }
+
+    Labs.MenuSeparator {
+    }
+
+    Labs.MenuItem {
+        enabled: editMenu.field !== null && editMenu.field.selectedText
+        text: i18nc("text editing menu action", "Cut")
+        shortcut: StandardKey.Cut
+        onTriggered: {
+            editMenu.field.cut()
+            editMenu.close()
+        }
+    }
+
+    Labs.MenuItem {
+        enabled: editMenu.field !== null && editMenu.field.selectedText
+        text: i18nc("text editing menu action", "Copy")
+        shortcut: StandardKey.Copy
+        onTriggered: {
+            editMenu.field.copy()
+            editMenu.close()
+        }
+    }
+
+    Labs.MenuItem {
+        enabled: editMenu.field !== null && editMenu.field.canPaste
+        text: i18nc("text editing menu action", "Paste")
+        shortcut: StandardKey.Paste
+        onTriggered: {
+            editMenu.field.paste()
+            editMenu.close()
+        }
+    }
+
+    Labs.MenuItem {
+        enabled: editMenu.field !== null && editMenu.field.selectedText !== ""
+        text: i18nc("text editing menu action", "Delete")
+        shortcut: ""
+        onTriggered: {
+            editMenu.field.remove(editMenu.field.selectionStart, editMenu.field.selectionEnd)
+            editMenu.close()
+        }
+    }
+
+    Labs.MenuSeparator {
+    }
+
+    Labs.MenuItem {
+        enabled: editMenu.field !== null
+        text: i18nc("text editing menu action", "Select All")
+        shortcut: StandardKey.SelectAll
+        onTriggered: {
+            editMenu.field.selectAll()
+            editMenu.close()
+        }
+    }
+}