e705330e40
Closes #37 Almost completely refactored the UI parts outline.nvim to use a Sidebar object that implements an outline window. In init.lua, we can then store a table of the outline for each tabpage ID. When tabs are closed the outline is closed and sidebar reset responsibly. This simplifies `init.lua` quite a lot, making it the highest level control center for the outline elements. All lua APIs and commands should work as before.