core implement status

[soburi]

• [x] ~~abi.cpp~~
• [x] Arduino.h
• [x] avr/dtostrf.c
• [x] avr/dtostrf.h
• [x] avr/interrupt.h
• [x] avr/io.h
• [x] avr/pgmspace.h
• [x] binary.h
• [x] Client.h
• [x] CMakeLists.txt
• [x] ~~cortex_handlers.c~~
• [x] ~~delay.c~~
• [x] delay.h
• [x] HardwareSerial.cpp
• [x] HardwareSerial.h
• [x] ~~hooks.c~~
• [x] IPAddress.cpp
• [x] IPAddress.h
• [x] itoa.c
• [x] itoa.h
• [x] main.cpp
• [x] ~~new.cpp~~
• [x] Print.cpp
• [x] Print.h
• [x] Printable.h
• [x] pulse.c ISSUE #24
• [x] pulse.h
• [x] ~~pulse_asm.S~~
• [x] ~~Reset.cpp~~
• [x] Reset.h
• [x] RingBuffer.h
• [x] sam.h
• [x] ~~SERCOM.cpp~~
• [x] ~~SERCOM.h~~
• [x] Server.h
• [x] ~~startup.c~~
• [x] Stream.cpp
• [x] Stream.h
• [x] Tone.cpp ISSUE #23
• [x] Tone.h
• [x] ~~Uart.cpp~~
• [x] ~~Uart.h~~
• [x] UartDevice.cpp
• [x] UartDevice.h
• [x] Udp.h
• [x] ~~USB/CDC.cpp~~
• [x] USB/CDC.h
• [x] ~~USB/PluggableUSB.cpp~~
• [x] USB/PluggableUSB.h
• [x] ~~USB/samd21_host.c~~
• [x] ~~USB/samd21_host.h~~
• [x] ~~USB/SAMD21_USBDevice.h~~
• [x] USB/USB_host.h
• [x] USB/USBAPI.h
• [x] ~~USB/USBCore.cpp~~
• [x] USB/USBCore.h
• [x] USB/USBDesc.h
• [x] variant_common.cpp
• [x] variant_common.h
• [x] WCharacter.h NEED TO CHANGE ZEPHYR SOURCE
• [x] WInterrupts.c
• [x] WInterrupts.h
• [x] wiring.c
• [x] wiring.h
• [ ] wiring_analog.c
• [x] wiring_analog.h
• [x] wiring_constants.h
• [x] wiring_digital.c
• [x] wiring_digital.h
• [x] wiring_private.c
• [x] wiring_private.h
• [x] wiring_shift.c
• [x] wiring_shift.h
• [x] WMath.cpp NEED TO CHANGE ZEPHYR SOURCE
• [x] WMath.h
• [x] WString.cpp NEED TO CHANGE ZEPHYR SOURCE
• [x] WString.h
• [x] WVariant.h