add a __tostring method to every object (#1534)

* added a stupid __tostring to every object

* moved every __tostring to just after the :extend() call

---------

Co-authored-by: Adam <adamdharrison@gmail.com>
(cherry picked from commit 880e7f1fa1521cdf176f44627a27c901e187058e)

data/core/docview.lua

@@ -11,6 +11,8 @@ local View = require "core.view"
 ---@field super core.view
 local DocView = View:extend()
 
+function DocView:__tostring() return "DocView" end
+
 DocView.context = "session"
 
 local function move_to_line_offset(dv, line, col, offset)
@@ -591,5 +593,4 @@ function DocView:draw()
   self:draw_scrollbar()
 end
 
-
 return DocView