just remove any reference to halfwise pages

[tomeichlersmith]

While the HGCROC manual mentions HALFWISE_0 and HALFWISE_1 and our register maps match the documented addresses listed there, I am not able to observe understandable behavior from them which makes me think that they are an experimental feature that is still buggy.

For example, when I write CHANNEL_OFF: 1 to HALFWISE_1, I would expect either

1. The halfwise pages are write only and the values written to them are copied onto all of the channels for that half. In this case, I would expect HALFWISE_1.CHANNEL_OFF to read back as 0 but CH_##.CHANNEL_OFF to read back as 1 for all ## [36, 71].
2. The halfwise pages are parameters that are overlaid on top of the channel parameters if they are non-zero. In this case, I would expect HALFWISE_1.CHANNEL_OFF to read back as 1, the CH_##.CHANNEL_OFF parameters would still read back as 0, but the channels in that half would behave like they were off.

I don't observe either of these behaviors, so I think avoiding this page is the best strategy moving forward. If we get newer versions of the HGCROC or its documentation that update this understanding, we can re-introduce these short-cut parameters.

This indirectly resolves #155 and indirectly resolves #344 by simply removing the page that was causing confusion.

To be clear, I do observe option (1) above for other parameters that are not CHANNEL_OFF (like ADC_PEDESTAL) which does make sense. Maybe I'll just try to remove CHANNEL_OFF from the halfwise page to avoid confusion in the future.