chore(runtime/plugins): all built-in plugins use the fixed version 1.0.0

As of commit `4c47a2713aafdb105d5a45ca0f859d0e7290f617`, the version of
built-in plugins is neither displayed nor used in any way.

Built-in plugins are not distributed through the plugin manager, so they
do not need `VERSION`.

The version of built-in plugins is determined by both Micro's version and
the commit hash. It is therefore unnecessary to maintain it using a third
version (`VERSION` in Lua).

Rather than removing `VERSION`, keep it in the code and document that it
should remain at version `1.0.0`. This way, the information remains
available to contributors and users.

`VERSION` is a vital part of the plugin manager. Removing it from built-in
plugins could confuse people who use them as references for their own plugins.

Author: usfbih8u

runtime/plugins/autoclose/autoclose.lua

@@ -1,4 +1,4 @@
-VERSION = "1.0.0"
+VERSION = "1.0.0" -- all built-in plugins fixed to 1.0.0
 
 local uutil = import("micro/util")
 local utf8 = import("utf8")

runtime/plugins/comment/comment.lua

@@ -1,4 +1,4 @@
-VERSION = "1.0.0"
+VERSION = "1.0.0" -- all built-in plugins fixed to 1.0.0
 
 local util = import("micro/util")
 local config = import("micro/config")

runtime/plugins/diff/diff.lua

@@ -1,4 +1,4 @@
-VERSION = "1.0.0"
+VERSION = "1.0.0" -- all built-in plugins fixed to 1.0.0
 
 local os = import("os")
 local filepath = import("path/filepath")

runtime/plugins/ftoptions/ftoptions.lua

@@ -1,4 +1,4 @@
-VERSION = "1.0.0"
+VERSION = "1.0.0" -- all built-in plugins fixed to 1.0.0
 
 function onBufferOpen(b)
     local ft = b:FileType()

runtime/plugins/linter/linter.lua

@@ -1,4 +1,4 @@
-VERSION = "1.0.0"
+VERSION = "1.0.0" -- all built-in plugins fixed to 1.0.0
 
 local micro = import("micro")
 local runtime = import("runtime")

runtime/plugins/literate/literate.lua

@@ -1,4 +1,4 @@
-VERSION = "1.0.0"
+VERSION = "1.0.0" -- all built-in plugins fixed to 1.0.0
 
 local config = import("micro/config")
 

runtime/plugins/status/status.lua

@@ -1,4 +1,4 @@
-VERSION = "1.0.0"
+VERSION = "1.0.0" -- all built-in plugins fixed to 1.0.0
 
 local micro = import("micro")
 local buffer = import("micro/buffer")