Add more jumpers for Teensy++ 2.0 compat This avoids requiring folks to pull pins out of headers for Teensy++ 2.0 compatibility, instead just requiring them to cut the traces, which I think is better and more importantly is reversible, so that if someone builds with a Teensy++ 2.0 and then wants to replace it with a 3.6, they can just re-close the new jumpers, desolder the old ones, and be good to go.

Update to the new project file format (#47) I opened and saved the project and its schematic, PCB, etc. Some got saved with a different file name extension. `kinx-cache.lib` had to been renamed to `kint-cache.lib` otherwise the Schematic editor would complain that the file is missing. Then I removed it as I was told in the IRC channel that after saving the schematic in the new format, the symbols will be embedded and it's no longer needed. When opening the PCB there was a warning: > If the zones on this board are refilled the Copper Edge Clearance > setting will be used (see Board Setup > Design Rules > Constraints). > This may result in different fills from previous KiCad versions which > used the line thicknesses of the board boundary on the Edge Cuts > layer. The File > Board Setup > Design Rules > Constraints > Copper Edge Clearance is 0.05mm. Clicking the board boundary belonging to the Edge Cuts layer reveals a properties dialog with Line Width 0.05mm. Being the same, nothing should change at the next refill. The `.gitignore` file has been updated from its original source.

update artifacts for v2021-06-26

connect GND3 (Teensy vertical pin header) to GND This removes the unexpected opens from the design. fixes https://github.com/kinx-project/kint/issues/38

update artifacts for v2021-04-25

Widen slots for compatibility with Aisler (#31) Aisler is a board service that introduced a budget service for "Simple" boards. KinT almost met the requirements, but these slots were too narrow. These zigzags make it so that the slots are always 2.4mm wide, but should still contact the posts and stabilize the board. fixes #27

update artifacts for v2020-06-30

adjust silkscreen, route traces to enable GND plane filling

update artifacts

give track some more space to the cutout