Added clip creation support 🎬 (#2271)

You can create clips with `/clip` command, `Alt+X` keybind or `Create a clip` option in split header's context menu. This requires a new authentication scope so re-authentication will be required to use it.

Co-authored-by: Leon Richardt <leon.richardt@gmail.com>
Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/widgets/settingspages/KeyboardSettingsPage.cpp

@@ -67,6 +67,7 @@ KeyboardSettingsPage::KeyboardSettingsPage()
     form->addRow(new QLabel("F5"),
                  new QLabel("Reload subscriber and channel emotes"));
     form->addRow(new QLabel("Ctrl + F5"), new QLabel("Reconnect channels"));
+    form->addRow(new QLabel("Alt + X"), new QLabel("Create a clip"));
 
     form->addItem(new QSpacerItem(16, 16));
     form->addRow(new QLabel("PageUp"), new QLabel("Scroll up"));