* draft implementation of tags/filters
* .
* add filtering:
- extended substring sorter to have modes:
- when current string is prefixed by `:foo`, results are tag_names that
come from tags/workspaces table. (if `:foo ` token is incomplete it is
ignored)
- when a complete workspace tag is matched ':foobar:', results are
indexed_files filtered by if their parent_dir is a descendant of the
workspace_dir
- a recursive scan_dir() result is added to the :foobar: filter
results; any non-indexed_files are given a score of zero, and are
alphabetically sorted below the indexed_results
- tab completion for tab_names in insert mode`:foo|` state: cycles
through available options
* add completion file
* use attach_mappings for <CR> map
* stop completion being enabled multiple times
* improve keys
* improve completion cancellation
* add dynamic `lsp` tag
* add dynamic `lsp` tag
* fix empty lsp workspaces
* remove hardcoded workspaces and allow config from ext_config
* add filter highlight and some fixes
* .
* add workspace filters to readme
* wip LSP workspace filter
* merge ignore_patterns fix
* change LSP_ROOT tagname to LSP
* fix setting default values
* .
* update readme with filter instructions
* remove debug message
* improve relative paths
* improve relative paths
* WIP dynamic column sizes
* WIP filter_column_width
* fix keymaps
* .
* feat: persistent filters
* refactor config creation
* fix: filter directory column autosize
* improve LSP workspace paths
* .
* remove workspace filter output
* cache persistent filter results
* fix cached results
* .
* remove results cache; sorting is the expensive part
* respect ignore patterns for non-indexed files.
* return table on on_input_filter_cb
