build: rename build-related dirs

Problem:
Dirs "config", "packaging", and "third-party" are all closely related
but this is not obvious from the layout. This adds friction for new
contributors.

Solution:
- rename config/ to cmake.config/
- rename test/config/ to test/cmakeconfig/ because it is used in Lua
  tests: require('test.cmakeconfig.paths').
- rename packaging/ to cmake.packaging/
- rename third-party/ to cmake.deps/ (parallel with .deps/)

test/functional/shada/shada_spec.lua

@@ -7,7 +7,7 @@ local write_file, spawn, set_session, nvim_prog, exc_exec =
   helpers.exc_exec
 
 local lfs = require('lfs')
-local paths = require('test.config.paths')
+local paths = require('test.cmakeconfig.paths')
 
 local mpack = require('mpack')
 

test/helpers.lua

@@ -4,7 +4,7 @@ local assert = require('luassert')
 local luv = require('luv')
 local lfs = require('lfs')
 local relpath = require('pl.path').relpath
-local Paths = require('test.config.paths')
+local Paths = require('test.cmakeconfig.paths')
 
 assert:set_parameter('TableFormatLevel', 100)
 

test/symbolic/klee/run.sh

@@ -54,7 +54,7 @@ main() {
   includes="$includes -I$PROJECT_SOURCE_DIR/src"
   includes="$includes -I$PROJECT_BINARY_DIR/src/nvim/auto"
   includes="$includes -I$PROJECT_BINARY_DIR/include"
-  includes="$includes -I$PROJECT_BINARY_DIR/config"
+  includes="$includes -I$PROJECT_BINARY_DIR/cmake.config"
   includes="$includes -I/host-includes"
 
   local defines=

test/unit/helpers.lua

@@ -2,7 +2,7 @@ local ffi = require('ffi')
 local formatc = require('test.unit.formatc')
 local Set = require('test.unit.set')
 local Preprocess = require('test.unit.preprocess')
-local Paths = require('test.config.paths')
+local Paths = require('test.cmakeconfig.paths')
 local global_helpers = require('test.helpers')
 local assert = require('luassert')
 local say = require('say')