Complete rewrite of the Data Acquisition module.

- Use various DMA 1 channels for ADC data copy instead of ADC 1 and ADC 2;
- Remove asynchronous data dispatch task in favor of a dispatch within the DMA interrupt;
- Clarify ADC functions purpose;
- Add error codes for Data Acquisition functions;
- Properly commented module headers;
- Made some ADC configuration available to user;
- Allow fine channel configuration for each adc;
- Per-channel data acquisition functions return buffers instead of FIFOs.