New optional column displaying container status using plain text characters (sans symbols/icons)

As suggested by @Brayyy in #293 (comment):

State:

• created: "C" (white)
• running: "R" (green)
• exited: "e" or "x" (gray)
• paused: "p" (blue)

Health:

• healthy: "H" (green)
• unhealthy: "U" or "!" (red)
• starting: "s" (gray)