Split IDE instructions into several pages, improve writing style

This removes the link to the KDevelop setup video tutorial as it's
now outdated.

IDE screenshots were also optimized losslessly using
`oxipng -o6 --strip --zopfli`.

See #3485.

development/cpp/configuring_an_ide/xcode.rst

@@ -0,0 +1,95 @@
+.. _doc_configuring_an_ide_xcode:
+
+Xcode
+=====
+
+Xcode is a free macOS-only IDE. You can download it from the Mac App Store.
+
+Project setup
+-------------
+
+- Create an Xcode external build project anywhere.
+
+.. image:: img/xcode_1_create_external_build_project.png
+
+Go to the build target's **Info** tab, then:
+
+- Set **Build Tool** to the full path to SCons.
+- Set **Arguments** to something like
+  ``platform=osx tools=yes bits=64 target=debug``.
+- Set **Directory** to the path to Godot's source folder.
+- You may uncheck **Pass build settings in environment**.
+
+.. image:: img/xcode_2_configure_scons.png
+
+Add a Command Line Tool target which will be used for indexing the project:
+
+- In Xcode's menu, choose **File > New > Target...** and add a new Xcode
+  command line tool target.
+
+.. image:: img/xcode_3_add_new_target.png
+
+.. image:: img/xcode_4_select_command_line_target.png
+
+- Name it something so you know not to compile with this target (e.g. ``GodotXcodeIndex``).
+- Goto the newly created target's **Build Settings** tab and look for **Header Search Paths**.
+- Set **Header Search Paths** to the absolute path to Godot's source folder.
+- Make it recursive by adding two asterisks (``**``) to the end of the path,
+  e.g. ``/Users/me/repos/godot-source/**``.
+
+Add the Godot source to the project:
+
+- Drag and drop Godot source into the project file browser.
+- Uncheck **Create external build system project**.
+
+.. image:: img/xcode_5_after_add_godot_source_to_project.png
+
+- Click **Next**.
+- Select **Create groups**.
+
+.. image:: img/xcode_6_after_add_godot_source_to_project_2.png
+
+- Check *only* your command line indexing target in the
+  **Add to targets** section.
+- Click finish. Xcode will now index the files. This may take a few minutes.
+- Once Xcode is done indexing, you should have jump-to-definition,
+  autocompletion, and full syntax highlighting.
+
+Scheme setup
+------------
+
+To enable debugging support, edit the external build target's build scheme:
+
+- Open the scheme editor of the external build target.
+- Expand the **Build** menu.
+- Goto **Post Actions**.
+- Add a new script run action, select your project in **Provide build settings from**
+  as this allows you to use the``${PROJECT_DIR}`` variable.
+
+.. image:: img/xcode_7_setup_build_post_action.png
+
+- Write a script that gives the binary a name that Xcode will recognize, such as:
+  ``ln -f ${PROJECT_DIR}/godot/bin/godot.osx.tools.64 ${PROJECT_DIR}/godot/bin/godot``
+- Build the external build target.
+
+Edit the external build target's Run scheme:
+
+- Open the scheme editor again.
+- Click **Run**.
+
+.. image:: img/xcode_8_setup_run_scheme.png
+
+- Set the **Executable** to the file you linked in your post-build action script.
+- Check **Debug executable** if it isn't checked already.
+- You can go to **Arguments** tab and specify the full path to a
+  ``project.godot`` file to debug the editor instead of the project manager.
+  Alternatively, use ``--path`` to point to a project *folder* which will be
+  run directly (instead of opening the editor).
+
+Test the Run scheme:
+
+- Set a breakpoint in ``platform/osx/godot_main_osx.mm``.
+- If all goes well, it should break at the specified breakpoint.
+
+If you run into any issues, ask for help in one of
+`Godot's community channels <https://godotengine.org/community>`__.