Add first examples for the WaveShare Open103R evaluation board

This pull request adds the first examples for the WaveShare Open103R evaluation board, which is based on the STM32F103RCT6 processor. Three examples  (miniblink, button, and fancyblink) are ports of examples from other evaluation boards, where the only changes substantive changes are for port pins, number of LEDs, and the use of pull-up resistors. One example (joystick) is a new example specifically for the Open103R evaluation board.