FmcAdc100M14b4cha firmware release 2.0

Changelog:
- Fix bug in pre/post_trig_done signals generation.
- Update wbgen wishbone interfaces (port name change).
- Change utc core name into timetag core.
- Takes the adc data for trigger threshold after offset/gain correction block.
- Move mezzanine related wb cores to a separate module.
- Rename top level fmc slot ports to be compatible with the svec (2 fmc slots).
- Change spec mapping to fit the svec mapping.
- Change serdes pll feedback.
- Add a software reset register to reset the mezzanine related cores.
- [ddr core] Fix wishbone interface to ignore stb if cyc is '0'.
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