Add direct link to manual under Help

CHANGELOG.md

@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project somewhat adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).  The MAJOR version number is bumped when there are **"Breaking Changes"** in the pret projects. For more on this, see [the manual page on breaking changes](https://huderlem.github.io/porymap/manual/breaking-changes.html).
 
 ## [Unreleased]
+### Added
+- A link to Porymap's manual is now available under `Help`.
+
 ### Changed
 - The scroll position of the map view now remains the same between the Connections tab and the Map/Events tabs.
 - The Move tool now behaves more like a traditional pan tool (with no momentum).

forms/mainwindow.ui

@@ -2926,6 +2926,7 @@
      <string>Help</string>
     </property>
     <addaction name="actionAbout_Porymap"/>
+    <addaction name="actionOpen_Manual"/>
     <addaction name="actionOpen_Log_File"/>
     <addaction name="actionOpen_Config_Folder"/>
     <addaction name="actionCheck_for_Updates"/>
@@ -3267,6 +3268,11 @@
     <string>Alt+Right</string>
    </property>
   </action>
+  <action name="actionOpen_Manual">
+   <property name="text">
+    <string>Open Manual</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <customwidgets>

include/mainwindow.h

@@ -286,6 +286,7 @@ private slots:
     void on_spinBox_SelectedCollision_valueChanged(int collision);
     void on_actionRegion_Map_Editor_triggered();
     void on_actionPreferences_triggered();
+    void on_actionOpen_Manual_triggered();
     void on_actionCheck_for_Updates_triggered();
     void togglePreferenceSpecificUi();
     void on_actionProject_Settings_triggered();

src/mainwindow.cpp

@@ -2905,6 +2905,11 @@ void MainWindow::on_actionOpen_Config_Folder_triggered() {
     QDesktopServices::openUrl(QUrl::fromLocalFile(QStandardPaths::writableLocation(QStandardPaths::AppDataLocation)));
 }
 
+void MainWindow::on_actionOpen_Manual_triggered() {
+    static const QUrl url("https://huderlem.github.io/porymap/");
+    QDesktopServices::openUrl(url);
+}
+
 void MainWindow::on_actionPreferences_triggered() {
     if (!preferenceEditor) {
         preferenceEditor = new PreferenceEditor(this);