They are lightning component actions. here is a snippet of one of the .cmp code

<aura:component controller="acceptedController" implements="flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,force:lightningQuickAction" access="global" >

<aura:attribute name="recordId" type="Id" />

<aura:attribute name="accname" type="String" />

<aura:attribute name="message" type="String" default=" " />

I am more than happy to share my screen in a go to meeting and demo it for you.