Refacto: rewrite everything

- The tree is created with libuv functions, which makes it blazingly fast.
- The tree may now be faster than any other vim trees, it can handle directories with thousands of files without any latency at all (tested on 40K files, works flawlessly).
- More solid logic for opening and closing the tree.
- tree state is remembered (closing / opening a folder keeps opened subdirectories open)
- detection of multiple git projects in the tree
- more icon support
- smart rendering
- smart updates
- ms windows support
- gx replacement function running xdg-open on linux, open on macos

plugin/tree.vim

@@ -10,32 +10,16 @@ hi def link LuaTreePopup Normal
 
 augroup LuaTree
   au BufWritePost * lua require'tree'.refresh()
-
-  if get(g:, 'lua_tree_auto_close') != 0
-    au BufEnter * lua require'tree'.check_windows_and_close()
-  endif
-
-  if get(g:, 'lua_tree_auto_open') != 0
-    au VimEnter * lua require'tree'.check_buffer_and_open()
-  endif
-
-  if get(g:, 'lua_tree_follow') != 0
-    au BufEnter * :LuaTreeFindFile
-  endif
-
-  au BufEnter * lua require'tree'.navigate_to_buffer_dir()
+  au BufEnter * lua require'tree'.buf_enter()
+  au VimEnter * lua require'tree'.on_enter()
   au ColorScheme * lua require'tree'.reset_highlight()
 augroup end
 
-" TODO: WinEnter is not the right autocommand for this task,
-" but we do not have LayoutChange or WinMove kind of option atm,
-" so this is deactivated by default to avoid messing up users workflows
-
-" au WinEnter * lua require'tree'.replace_tree()
-
+command! LuaTreeOpen lua require'tree'.open()
+command! LuaTreeClose lua require'tree'.close()
 command! LuaTreeToggle lua require'tree'.toggle()
 command! LuaTreeRefresh lua require'tree'.refresh()
-command! LuaTreeFindFile lua require'tree'.find()
+command! LuaTreeFindFile lua require'tree'.find_file()
 
 let &cpo = s:save_cpo
 unlet s:save_cpo