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/commandview.lua

@@ -10,6 +10,8 @@ local View = require "core.view"
 ---@field super core.doc
 local SingleLineDoc = Doc:extend()
 
+function SingleLineDoc:__tostring() return "SingleLineDoc" end
+
 function SingleLineDoc:insert(line, col, text)
   SingleLineDoc.super.insert(self, line, col, text:gsub("\n", ""))
 end
@@ -18,6 +20,8 @@ end
 ---@field super core.docview
 local CommandView = DocView:extend()
 
+function CommandView:__tostring() return "CommandView" end
+
 CommandView.context = "application"
 
 local max_suggestions = 10
@@ -391,5 +395,4 @@ function CommandView:draw()
   end
 end
 
-
 return CommandView