Improve the diode LEF files.

This change improves the `diode_2` and `fill_diode_[248]` LEF files in
the `sky130_fd_sc_hs` and `sky130_fd_sc_ms` libraries.

These changes include;
 * Adding `USE` and `SHAPE` properties.
 * Removing `CORE` class.
 * Fix layer for power pins.

This fixes https://github.com/google/skywater-pdk/issues/141.

Updating submodules on 2020-11-04 07:12:35 UTC

 - Updating [`sky130_fd_sc_hs` latest](https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_sc_hs/+/v0.0.2-46-g2d165a2ff..v0.0.2-48-g98372f073) to v0.0.2-48-g98372f073
 - Updating [`sky130_fd_sc_hs` v0.0.1](https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_sc_hs/+/v0.0.1-23-gb81bfbb8d..v0.0.1-24-g7ad9f328a) to v0.0.1-24-g7ad9f328a
 - Updating [`sky130_fd_sc_hs` v0.0.2](https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_sc_hs/+/v0.0.2-46-g2d165a2ff..v0.0.2-48-g98372f073) to v0.0.2-48-g98372f073
 - Updating [`sky130_fd_sc_ms` latest](https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_sc_ms/+/v0.0.2-48-g175daa5e8..v0.0.2-50-gfa42f3825) to v0.0.2-50-gfa42f3825
 - Updating [`sky130_fd_sc_ms` v0.0.1](https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_sc_ms/+/v0.0.1-24-ga2ecab114..v0.0.1-25-g2fbf63838) to v0.0.1-25-g2fbf63838
 - Updating [`sky130_fd_sc_ms` v0.0.2](https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_sc_ms/+/v0.0.2-48-g175daa5e8..v0.0.2-50-gfa42f3825) to v0.0.2-50-gfa42f3825

 * libraries/sky130_fd_sc_hs/latest 2d165a2...98372f0 (1):
   > Improve diode LEF files.

 * libraries/sky130_fd_sc_hs/v0.0.1 b81bfbb...7ad9f32 (1):
   > Improve diode LEF files.

 * libraries/sky130_fd_sc_hs/v0.0.2 2d165a2...98372f0 (1):
   > Improve diode LEF files.

 * libraries/sky130_fd_sc_ms/latest 175daa5...fa42f38 (1):
   > Improve diode LEF files.

 * libraries/sky130_fd_sc_ms/v0.0.1 a2ecab1...2fbf638 (1):
   > Improve diode LEF files.

 * libraries/sky130_fd_sc_ms/v0.0.2 175daa5...fa42f38 (1):
   > Improve diode LEF files.

Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>
6 files changed