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/python/packages.el

@@ -17,6 +17,7 @@
   (package! conda))
 
 ;; Programming environment
-(when (package! anaconda-mode)
+(unless (featurep! +lsp)
+  (package! anaconda-mode)
   (when (featurep! :completion company)
     (package! company-anaconda)))