[Feature] Close filtering UI when Esc is pressed, even if the filtering UI doesn't have focus. Fixes #189
[Feature] In-progress: implement functions to always directionally change CU selection without page scrolling etc
[Feature/Usability]  Prevent the browser from changing scroll position due to the main element of a CU getting focus (since we would have already adjusted the scroll position if required). Closes #190
[Feature] Improved directional navigation. Closes #191