Add a pre commit hook to lint code

This uses pre-commit [1] to check patches are well formed and run
several linters on them. We currently do some boring things (check files
are syntactically valid) as well as some project-specific ones:
 - Run illuaminate on the Lua files
 - Run checkstyle on Java

[1]: https://pre-commit.com/

config/idea/codeInspectionSettings.xml

@@ -2488,4 +2488,4 @@
       </option>
     </inspection_tool>
   </profile>
-</component>
+</component>

config/idea/codeStyleSettings.xml

@@ -58,4 +58,4 @@
       <option name="CONTINUATION_INDENT_SIZE" value="4" />
     </indentOptions>
   </codeStyleSettings>
-</code_scheme>
+</code_scheme>