remember panel position;
panel is sticky to screen edges;
added auto un-collapsing;
fixed bug with stickiness to bottom edge
Merge branch 'release/1.57' into develop
removed unused variables
add button and checkbox only if they aren't exist yet
Merge pull request #44 from kroleg/fix/rendering-overlay-thumb-on-model-update

Fix/rendering overlay thumb on model update
Merge branch 'kroleg-feature/remember-panel-position' into develop

Conflicts:
	Extension/shared.js
	Extension/views/view.js
Bug with layers are not loaded to layers list is fixed
Animation is added to new sticky behavior
Version is changed to 1.60
Merge branch 'release/1.60'