4.6.0

• Added new board nucleo_f722ze (issue #81)
• Added new board nucleo_h743zi (issue #150)
• Support for official STM32 Core for Arduino (issue #76)
• Switched to official J-Link tool for uploading and debugging
• Allowed DFU protocol for other frameworks (issue #164)
• Updated support for CMSIS framework (issue #143)
• Updated support for STM32Cube framework
• Updated STM32Duino tool to 1.0.1
• Removed dependency on build.variant field from SPL framework
• Fixed invalid upload port when serial protocol is used (issue #138)