Using `misc/scripts/fix_headers.py` on all Godot files.
Some missing header guards were added, and the header inclusion order
was fixed in the Bullet module.
- EditorExportPlugin's _export_begin accepts all the arguments related
to the current export (is_debug, path, flags).
- EditorExportPlugin API is extended with methods allowing to configure
iOS export: add_ios_framework, add_ios_plist_content,
add_ios_linker_flags, add_ios_bundle_file.
- iOS export template now contains Godot as a static library so that
it can be linked with third-party Frameworks and GDNative static
libraries.
- Adds method to DirAccess for recursive copying of a directory.
- Fixes iOS export to work with Xcode 9 (released recently).
- The export process now builds complete .ipa on macOS, instead of just
creating XCode project.
- The project includes Capabilities games usually require: Game Center,
Push Notifications, In-App Purchase.
- Icons and launch screens can be specified in export preset.
