make I2C controller push-pull #307
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As discussed, the controller logic will now operate as a push-pull driver. This gives flexibility since if that is desired it will be the default, and adapting a push-pull driver to be open-drain is simple when accompanying tristate logic is still present.
This change also changes the target VC to utilize the
*_intsignals for rising/falling edge triggers since those are adapted to '0' or '1' from the std_logic inout pins.