Draft: Cleanup warnings

Re-enabled all compiler warnings from daqling and tried to fix all of them apart the digitizer receiver (being worked on in parallel by Edward) and GPIO drivers as I am not sure the right branch to use for that (I have a fix locally).

Since there were quite a few changes to casts at data types from "int" to "unsigned int" etc., code will need to be tested on the TI12 server before merging.