Refactor and style correction

[primercuervo]

In my last pull request I stated that the code for noc_block_chanmux was missing. Turns out that it is now called noc_block_channelizer, which I added in that same PR. Given that confusion, I went ahead and refactored the code slightly. This PR intends to:

• Remove the taps_update python block, which was migrated to pure C++ and integrated into chanmux
• Remove the unused boilerplate in rfnoc/fpga-srcs (that is, deleted the noc_block_chanmux instances there).
• Applied verilog code guidelines for header and indentation
• Removed precompiled headers
• Various superfluous comment removal.

These commits can be squashed if required.