added scrollhead feature
added popup menus, cleaned up code
added scrollhead to project, build script; cleaned up dependencies
Merge branch 'master' into refactor/scrollhead
fixed position of scrollhead in build script
added icon display
added scrollhead preferences
Merge branch 'master' into refactor/scrollhead
renamed scrollhead to breadcrumb
renamed scrollhead to breadcrumb
huge performance improvement
Merge branch 'master' into refactor/scrollhead
updated build script
added hierarchical structure as combination of ITreeViewable and IBreadcrumb
worsened breadcrumb design; introduced switch for icons in editor; filtered out default icons
Merge branch 'master' into refactor/scrollhead