basic positioning and icon choice
zooming buttons brought in.
arraow keys
Merge pull request #263 from IIIF/bug-fixes

Thumbnail regularization, replace object button
merged master
updated functions calls while exploring #264
resolved #254, fixes #264
Merge pull request #265 from IIIF/surrogate-osd-controls#254

Surrogate osd controls#254
bottom panel integrated with hud controls. Open and close animation. Refactor bottom panel to use event system and a setter. Closes #253.
Merge pull request #266 from IIIF/surrogate-osd-controls#254

bottom panel integrated with hud controls. Open and close animation. Ref...
fixes #268, and changes z-index of metadata panel to be above the hud controls.
Merge pull request #269 from IIIF/surrogate-osd-controls#254

fixes #268, and changes z-index of metadata panel to be above the hud co...
remove old subscribed events