Assembly holder is no longer secured or unsecured. Screwdrive now disassemble it and attack_self to interact with its parts.
Adding feedback message when trying to attach two assemblies that aren't both in attach mode.
Fix hacky code to prime grenade by pulsing its assembly.
Removing some commented code and some duplicated proc instances.
Fixing a typo.
Merge pull request #6541 from phil235/GrenadeAssemblyConstructionFailMsgFix

Assembly holder no longer needs to be secured.