Remove background-color from color-picker button
Fixing Preview panel rdefs thumbs from 902a96b
Color button instead of checkbox to toggle channel in rdef table
Remove channel toggle buttons from beside Preview viewer
Image viewer buttons in toolbar style too
merge develop -Dorg -Ssuccess-only: PR 2435 (cpp: RTypesI: use static locals in place of duplicated globals)
merge develop -Dorg -Ssuccess-only: PR 2835 (Update OmeroPy/src/path.py)
merge develop -Dorg -Ssuccess-only: PR 2884 (fix #10766: add API method for changing original files' hasher)
merge develop -Dorg -Ssuccess-only: PR 2895 (Reload groups after users added/removed)
merge develop -Dorg -Ssuccess-only: PR 2902 (OmeroPy: src flake8 (I))
merge develop -Dorg -Ssuccess-only: PR 2905 (Renderings settings )
merge develop -Dorg -Ssuccess-only: PR 2907 (Preview panel like insight)
merge develop -Dorg -Ssuccess-only: PR 2912 (Java8)
merge develop -Dorg -Ssuccess-only: PR 2916 (Add 2008ServerR2 support to DropBox (rebased onto develop))
merge develop -Dorg -Ssuccess-only: PR 2918 (Fix createMask.m)
merge develop -Dorg -Ssuccess-only: PR 2919 (fix #7240: provide disk usage count)
merge develop -Dorg -Ssuccess-only: PR 2926 (OmeroCpp: Glob test sources)
merge develop -Dorg -Ssuccess-only: PR 2927 (OmeroCpp: Glob example sources)
merge develop -Dorg -Ssuccess-only: PR 2934 (cmake: Add versioning of build, library and installation metadata)
merge develop -Dorg -Ssuccess-only: PR 2936 (Viewer on tablets)