chore: refacto setup part 1 (#603)

* chore: refacto setup part 1

refacto setup for code entrypoint
following options switched boolean values as options to the setup function:
- `nvim_tree_disable_netrw` -> `disable_netrw`
- `nvim_tree_hijack_netrw` -> `hijack_netrw`
- `nvim_tree_auto_open` -> `open_on_setup`
- `nvim_tree_auto_close` -> `auto_close`
- `nvim_tree_tab_open` -> `tab_open`
- `nvim-tree-update-cwd` -> `update_cwd`
- `nvim_tree_hijack_cursor` -> `hijack_cursor`
- `nvim_tree_system_open_command` -> `system_open.cmd`
- `nvim_tree_system_open_command_args` -> `system_open.args`
- `nvim_tree_follow` -> `update_focused_file.enable`
- `nvim_tree_follow_update_path` -> `update_focused_file.update_cwd`
Also added new option `update_focused_file.ignore_list` which will
ignore filepath or filetypes that matches one entry of the list when
updating the path if update_cwd is true.

* add deprecation warning

* update readme

* schedule on enter to avoid running before vim first buffer has loaded

* update docs

* correct typo

* rename tab open -> open on tab

plugin/tree.vim

@@ -1,49 +0,0 @@
-if !has('nvim-0.5') || exists('g:loaded_tree') | finish | endif
-
-let s:save_cpo = &cpo
-set cpo&vim
-
-if get(g:, 'nvim_tree_disable_netrw', 1) == 1
-    let g:loaded_netrw = 1
-    let g:loaded_netrwPlugin = 1
-endif
-
-augroup NvimTree
-  if get(g:, 'nvim_tree_hijack_netrw', 1) == 1 && get(g:, 'nvim_tree_disable_netrw', 1) == 0
-    silent! autocmd! FileExplorer *
-  endif
-  au BufWritePost * lua require'nvim-tree'.refresh()
-  if get(g:, 'nvim_tree_lsp_diagnostics', 0) == 1
-    au User LspDiagnosticsChanged lua require'nvim-tree.diagnostics'.update()
-  endif
-  au BufEnter * lua require'nvim-tree'.buf_enter()
-  if get(g:, 'nvim_tree_auto_close') == 1
-    au WinClosed * lua require'nvim-tree'.on_leave()
-  endif
-  au ColorScheme * lua require'nvim-tree'.reset_highlight()
-  au User FugitiveChanged,NeogitStatusRefreshed lua require'nvim-tree'.refresh()
-  if get(g:, 'nvim_tree_tab_open') == 1
-    au TabEnter * lua require'nvim-tree'.tab_change()
-  endif
-  au SessionLoadPost * lua require'nvim-tree.view'._wipe_rogue_buffer()
-  if get(g:, 'nvim_tree_hijack_cursor', 1) == 1
-    au CursorMoved NvimTree lua require'nvim-tree'.place_cursor_on_node()
-  endif
-  if get(g:, 'nvim_tree_update_cwd') == 1
-    au DirChanged * lua require'nvim-tree.lib'.change_dir(vim.loop.cwd())
-  endif
-augroup end
-
-command! NvimTreeOpen lua require'nvim-tree'.open()
-command! NvimTreeClose lua require'nvim-tree'.close()
-command! NvimTreeToggle lua require'nvim-tree'.toggle()
-command! NvimTreeFocus lua require'nvim-tree'.focus()
-command! NvimTreeRefresh lua require'nvim-tree'.refresh()
-command! NvimTreeClipboard lua require'nvim-tree'.print_clipboard()
-command! NvimTreeFindFile lua require'nvim-tree'.find_file(true)
-command! -nargs=1 NvimTreeResize lua require'nvim-tree'.resize(<args>)
-
-let &cpo = s:save_cpo
-unlet s:save_cpo
-
-let g:loaded_tree = 1