3 new commits pushed to

<https://github.com/RTimothyEdwards/open_pdks/tree/master|master>

by RTimothyEdwards

<https://github.com/RTimothyEdwards/open_pdks/commit/3d8c263c0d2be1930f8b76058ecf2c1c7c0f4e4a|3d8c263c>

- Modified the "directional surround" rules in the magic tech file

<https://github.com/RTimothyEdwards/open_pdks/commit/929c8a22b5b19b53ae5333979aae725064957501|929c8a22>

- Added "endcap" to "filltie" for digital standard cells that should

<https://github.com/RTimothyEdwards/open_pdks/commit/6a8bf1c6467ac346b9948478c0af686a1dcc0550|6a8bf1c6>

- Modified the liberty and verilog filters for gf180mcu to prevent RTimothyEdwards/open_pdks