Important things first:
I renamed a bunch of files to work around a Unity bug that made development harder.
While it should still work fine if you just import the new version on top of the old one, I suggest just removing the shader's folder and importing it anew just in case.
This release also fixes an issue with my previous implementation of the Minimum Brightness - I didn't think it through and risked division by 0 issues with darker colors. Sorry to everyone who experienced that.
Rest of the stuff:
Changed features:
~ Two Sided -> Face Culling
Added the front face culling option.
~ VRC Light Volumes
Added support for the VRC Light Volumes to the deferred rendering pipeline's version of Standard shaders. Not important for VRC atm really.
New features:
+ Double-Sided Lighting and Translucency
Inspired by Hiyu's Spiri'vali Feather shader, I've added a support for proper lighting calculations for the back faces, and simple light transmission.
+ Dynamic GUI
Improved the GUIs of the shaders to make it clear which color channels are used for each property.
They also change dynamically based on relevant settings, and show warnings to clarify some possible issues.
Other minor fixes.
Full Changelog: rel_v4...rel_v5