* Fix jump regression in LSP references action handler
This change restores the possibility to exclude the current line when
invoking the lsp_references picker.
- opts.include_current_line is by default unset, so the previous
equality check would fail unless the option was set explicitly.
- vim.api.nvim_win_get_cursor() returns both line and column, so it
can't be directly compared with the returned line number.
- The actual comparison was expecting quickfix-like items, when in
actuality, we were dealing with raw LSP location objects.
* lsp: Pass offset_encoding to action_handlers
* LSP: Action handlers take both locations and items
* LSP: Rename (flattened_)results → locations
* LSP: Early return in list_or_jump
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