Add basic LSP support

Still needs to be documented, but includes support for the following
languages:

+ C/C++/ObjC
+ Go
+ Java
+ Javascript
+ OCaml
+ PHP
+ Python
+ Ruby
+ Scala
+ Swift
+ HTML/CSS

Relevant to #460, #716, #1186

modules/lang/ocaml/config.el

@@ -1,5 +1,9 @@
 ;;; lang/ocaml/config.el -*- lexical-binding: t; -*-
 
+(when (featurep! +lsp)
+  (add-hook! (tuareg-mode reason-mode) #'+lsp|init))
+
+
 (after! tuareg
   ;; tuareg-mode has the prettify symbols itself
   (set-pretty-symbols! 'tuareg-mode :alist
@@ -18,6 +22,7 @@
 
 
   (def-package! merlin
+    :unless (featurep! +lsp)
     :defer t
     :init
     (defun +ocaml|init-merlin ()
@@ -37,7 +42,20 @@
     (map! :localleader
           :map tuareg-mode-map
           "t" #'merlin-type-enclosing
-          "a" #'tuareg-find-alternate-file))
+          "a" #'tuareg-find-alternate-file)
+
+    (def-package! merlin-eldoc
+      :hook (merlin-mode . merlin-eldoc-setup))
+
+    (def-package! merlin-iedit
+      :when (featurep! :editor multiple-cursors)
+      :config
+      (map! :map tuareg-mode-map
+            :v "R" #'merlin-iedit-occurrences))
+
+    (def-package! merlin-imenu
+      :when (featurep! :emacs imenu)
+      :hook (merlin-mode . merlin-use-merlin-imenu)))
 
 
   (def-package! flycheck-ocaml
@@ -53,22 +71,6 @@
     (add-hook 'merlin-mode-hook #'+ocaml|init-flycheck))
 
 
-  (def-package! merlin-eldoc
-    :hook (merlin-mode . merlin-eldoc-setup))
-
-
-  (def-package! merlin-iedit
-    :when (featurep! :editor multiple-cursors)
-    :config
-    (map! :map tuareg-mode-map
-          :v "R" #'merlin-iedit-occurrences))
-
-
-  (def-package! merlin-imenu
-    :when (featurep! :emacs imenu)
-    :hook (merlin-mode . merlin-use-merlin-imenu))
-
-
   (def-package! utop
     :when (featurep! :feature eval)
     :defer t  ; loaded by hook below