Move C/C++ and CMake to c-c++ layer

Although CMake can support different compilers it is mainly
used for C++ projects. So it makes sense to add it here.

contrib/lang/c-c++/README.md

@@ -0,0 +1,30 @@
+# C/C++ contribution layer for Spacemacs
+
+![cc++](ccpp.png)
+![cmake](cmake.png)
+
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc/generate-toc again -->
+**Table of Contents**
+
+- [C/C++ contribution layer for Spacemacs](#cc-contribution-layer-for-spacemacs)
+    - [Description](#description)
+    - [Install](#install)
+
+<!-- markdown-toc end -->
+
+## Description
+
+This layer adds configuration for C/C++ language as well support for [CMake][]
+scripts.
+
+## Install
+
+To use this contribution add it to your `~/.spacemacs`
+
+```elisp
+(setq-default dotspacemacs-configuration-layers '(c-c++)
+  "List of contribution to load."
+)
+```
+
+[CMake]: http://www.cmake.org/

contrib/lang/c-c++/packages.el

@@ -0,0 +1,24 @@
+(defvar c-c++-packages
+  '(
+    cc-mode
+    cmake-mode
+    )
+  "List of all packages to install and/or initialize. Built-in packages
+which require an initialization must be listed explicitly in the list.")
+
+(defun c-c++/init-cc-mode ()
+  (use-package cc-mode
+    :defer t
+    :config
+    (progn
+      (add-hook 'c-mode-hook '(lambda () (c-toggle-auto-state t)))
+      (add-hook 'c++-mode-hook '(lambda () (c-toggle-auto-state t))))))
+
+(defun c-c++/init-cmake-mode ()
+(use-package cmake-mode
+  :defer t
+  :init
+  (setq auto-mode-alist
+        (append '(("CMakeLists\\.txt\\'" . cmake-mode)
+                  ("\\.cmake\\'" . cmake-mode))
+                auto-mode-alist))))

spacemacs/packages.el

@@ -10,8 +10,6 @@
     auto-highlight-symbol
     bookmark
     buffer-move
-    cc-mode
-    cmake-mode
     dash
     diminish
     dired+
@@ -444,23 +442,6 @@ which require an initialization must be listed explicitly in the list.")
       "bmk" 'buf-move-up
       "bml" 'buf-move-right)))
 
-(defun spacemacs/init-cc-mode ()
-  (use-package cc-mode
-    :defer t
-    :config
-    (progn
-      (add-hook 'c-mode-hook '(lambda () (c-toggle-auto-state t)))
-      (add-hook 'c++-mode-hook '(lambda () (c-toggle-auto-state t))))))
-
-(defun spacemacs/init-cmake-mode ()
-(use-package cmake-mode
-  :defer t
-  :init
-  (setq auto-mode-alist
-        (append '(("CMakeLists\\.txt\\'" . cmake-mode)
-                  ("\\.cmake\\'" . cmake-mode))
-                auto-mode-alist))))
-
 (defun spacemacs/init-diminish ()
   (require 'diminish)
   ;; Minor modes abbrev --------------------------------------------------------