Adding testpoints for amplifier soldering check

[CRImier]

The TPA2005 speaker amplifier is currently the lowest-pitch component on the ZP PCBs, with 0.5mm pitch. Someone attaching it with a soldering iron will need a good way to check its soldering quality, adding testpoints for every pin on the front would help detect shorts between pins or bad solder joints. In addition to that, if testpoints are well-placed enough, patch boards could be made for even easier soldering.