~ruther/vhdl-i2c

ref: cc661c4610360bb0d53eac8db572463543ae0143 vhdl-i2c/src/i2c d---------
fix: some stuff
fix: logic fixes master state
fix: address generator minor issues
fix: start stop condition generator behavior
fix: make sure scl changed after delay
fix: scl generator minor mistakes
feat: add master top entity
feat: add master state entity
feat: add scl generator
feat: add address generator
feat: add start, stop condition generator
feat: add waiting output to slave
feat: add done fields to tx, rx
chore: get rid of "pulse" from scl names
feat: handle errors in slave state

Moves logic of error handling to slave_state
from tx entity.
feat: add unexpected_sda tx signal
feat: add clear_buffer input to tx
fix: make slave work
feat: add slave top
feat: handle ack in rx, tx
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