feat: support search/find within a key

Close #61

Author: luin

client/components/main/Main/Database/Content/KeyContent/Editor.jsx

@@ -9,6 +9,11 @@ require('codemirror/addon/lint/lint');
 require('codemirror/addon/selection/active-line');
 require('codemirror/addon/edit/closebrackets');
 require('codemirror/addon/edit/matchbrackets');
+require('codemirror/addon/search/search');
+require('codemirror/addon/search/searchcursor');
+require('codemirror/addon/search/jump-to-line');
+require('codemirror/addon/dialog/dialog');
+require('codemirror/addon/dialog/dialog.css');
 import jsonlint from 'jsonlint';
 window.jsonlint = jsonlint.parser;
 require('codemirror/lib/codemirror.css');