[dev] [st] [patch] ARGB background for st-0.4.1

Hi. I've made a short patch that enables semi-transparent background for st-0.4.1. The same mechanism should work with recent commits. Some important notes: 1) This changes background opacity only. 2) The color designated by "defaultbg" are modified during the initialization, so you should add

RE: [dev] [st] [patch] ARGB background for st-0.4.1

Yes, a composite manager is required. I forgot to mention that. I recommend compton, which is a fork of xcompmgr, but xcompmgr still works well.