feat: refresh lualine based on timer + winbar support. (#736)

* feat: refresh lualine based on timer.

* fix config test

* fix lag on win change issue

* handle errors in timer callback

* feat: add winbar support

Pull in winbar changes form pr #689 and adapt them
Co-authored-by: shadmansaleh <13149513+shadmansaleh@users.noreply.github.com>

* make winbar disapear when winbar evals empty

* only update stl of curwin with globalstatus

* properly clear win local stl and wbr opts

* add version guards for winbar feature

* only add winbar if height > 1

* fix tests?

* refresh lualine on ModeChanged event

* ignore floating windows for refresh

* properply restore options to previous state

* fix stl not updating in cmd mode + some optimizations

* fix tests on <nvim-0.7

* merge status_dispatch & winbar_dispatch + winbar support for extensions

* fix globalstatus option not live updating

* update docs

* feat: allow disabling winbar and statusline separately

* fix tests

* fix: winbar some times oddly throwing errors

about not having space in floating windows.

This implements a temporary workaround the issue(neovim/neovim#19464)
until the bug in neovim gets fixed.

Co-authored-by: Diego Fujii <android.mxdiego9@gmail.com>

README.md

@@ -121,9 +121,17 @@ require('lualine').setup {
     theme = 'auto',
     component_separators = { left = '', right = ''},
     section_separators = { left = '', right = ''},
-    disabled_filetypes = {},
+    disabled_filetypes = {
+      statusline = {},
+      winbar = {},
+    },
     always_divide_middle = true,
     globalstatus = false,
+    refresh = {
+      statusline = 1000,
+      tabline = 1000,
+      winbar = 1000,
+    }
   },
   sections = {
     lualine_a = {'mode'},
@@ -142,6 +150,8 @@ require('lualine').setup {
     lualine_z = {}
   },
   tabline = {},
+  winbar = {},
+  inactive_winbar = {},
   extensions = {}
 }
 ```
@@ -336,13 +346,28 @@ options = {
   theme = 'auto', -- lualine theme
   component_separators = { left = '', right = '' },
   section_separators = { left = '', right = '' },
-  disabled_filetypes = {},     -- Filetypes to disable lualine for.
+  disabled_filetypes = {     -- Filetypes to disable lualine for.
+      statusline = {},       -- only ignores the ft for statusline.
+      winbar = {},           -- only ignores the ft for winbar.
+  },
+
   always_divide_middle = true, -- When set to true, left sections i.e. 'a','b' and 'c'
                                -- can't take over the entire statusline even
                                -- if neither of 'x', 'y' or 'z' are present.
+
   globalstatus = false,        -- enable global statusline (have a single statusline
                                -- at bottom of neovim instead of one for  every window).
                                -- This feature is only available in neovim 0.7 and higher.
+
+  refresh = {                  -- sets how often lualine should refreash it's contents (in ms)
+    statusline = 1000,         -- The refresh option sets minimum time that lualine tries
+    tabline = 1000,            -- to maintain between refresh. It's not guarantied if situation
+    winbar = 1000              -- arises that lualine needs to refresh itself before this time
+                               -- it'll do it.
+
+                               -- Also you can force lualine's refresh by calling refresh function
+                               -- like require('lualine').refresh()
+  }
 }
 ```
 
@@ -689,6 +714,34 @@ tabline = {
 }
 ```
 
+### Winbar
+From neovim-0.8 you can customize your winbar with lualine.
+Winbar configuration is similar to statusline.
+```lua
+winbar = {
+  lualine_a = {},
+  lualine_b = {},
+  lualine_c = {'filename'},
+  lualine_x = {},
+  lualine_y = {},
+  lualine_z = {}
+}
+
+inactive_winbar = {
+  lualine_a = {},
+  lualine_b = {},
+  lualine_c = {'filename'},
+  lualine_x = {},
+  lualine_y = {},
+  lualine_z = {}
+}
+```
+Just like statusline you can separately specify winbar for active and inactive
+windows. Any lualine component can be placed in winbar. All kinds of custom
+components supported in statusline are also suported for winbar too. In general
+You can treat winbar as another lualine statusline that just appears on top
+of windows instead of at bottom.
+
 #### Buffers
 
 Shows currently open buffers. Like bufferline . See