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/java/+lsp.el

@@ -0,0 +1,10 @@
+;;; lang/java/+lsp.el -*- lexical-binding: t; -*-
+;;;###if (featurep! +lsp)
+
+(def-package! lsp-java
+  :after-call java-mode
+  :init (add-hook 'java-mode-hook #'+lsp|init)
+  :config
+  ;; TODO keybinds
+  ;; TODO treemacs integration (?)
+  )

modules/lang/java/config.el

@@ -23,7 +23,8 @@ If the depth is 2, the first two directories are removed: net.lissner.game.")
 
 (add-hook 'java-mode-hook #'rainbow-delimiters-mode)
 
-(cond ((featurep! +meghanada) (load! "+meghanada"))
+(cond ((featurep! +lsp) (load! "+lsp"))
+      ((featurep! +meghanada) (load! "+meghanada"))
       ;; TODO lang/java +lsp (lsp-java?)
       ;; ((featurep! +lsp) (load! "+lsp"))
       )

modules/lang/java/packages.el

@@ -12,3 +12,5 @@
   (when (featurep! :completion company)
     (package! company-emacs-eclim)))
 
+(when (featurep! +lsp)
+  (package! lsp-java))