Clean-up TODO list

The following mainly concerns the fmc-adc, fmc-tdc and spec projects.

General idea

1. Split test project in two, common (pts project) and board specific (-tst project)
2. Keep gnurabbit.
   -> move common test code to pts-tmp
   -> move specific test code to <prj_name>-tst
   -> move hdl code to <prj_name>-gw
3. Define a new generic API and implement library.
4. Port tests to new library.

pts common code

• Add test example.

fmc-adc-tst

• move to new API.

pts fmc-tdc

• hdl test source code to gateware sub-project.
• split in two parts.
• Adapt tests to common classes
  -> at least eeprom_24AA64
  -> check others
• calibr_box.py and cp210x_eeprom.py are specific to tdc, should be placed in fmc-tdc-tst (not in common).
• move to new API.

SPEC

• hdl test source code to gateware sub-project.
• split in two parts.
• move to new API.

pts fmc-fdelay

• split in two parts.
• ?