Enabled ARC for iOS.
Weakify/Strongify macros for objc blocks.
Removed old version checks.
Specific types for ObjC++ modules to exclude unneeded bridging.
Separate DeviceMetrics class for device specific data.
Replaced old/deprecated functionality.
Depending on the device implementation, editor actions could be
received with different action ids or not at all for multi-line.
Added a parameter to virtual keyboards to properly handle single-line
and multi-line cases in all situations.
Single-line:
Input type set to text without multiline to make sure actions are sent.
IME options are set to DONE action to force action id consistency.
Multi-line:
Input type set to text and multiline to make sure enter triggers new lines.
Actions are disabled by the multiline flag, so '\n' characters are
handled in text changed callbacks.
Implemented Vulkan Support.
Use DisplayServer for rendering and input handling
Use single view for rendering in both GLES2 (not supported yet) and Vulkan
Use @available checks where it's required (otherwise compiler would fail compilation)
Simulator checks
