v0.10.15

ImageView v0.10.15

Diff since v0.10.14

Closed issues:

• Can't reach Playback context menu for changing FPS (#144)
• InitError on a 32bit raspberry pi (#232)
• don't depend on Images (#252)

Merged pull requests:

• Switch to TAGBOT key for CompatHelper (#254) (@timholy)
• Replace Images dependency (#256) (@timholy)