Add some linting rules for the CI (#587)

* enable one-var rule

* enable indent rule

* enable no-multiple-empty-lines rule

* enable no-empty rule

* enable no-trailing-spaces rule

* enable no-extra-semi rule

* add eslint rules to fix block spacing

* enable max-statements-per-line rule

* enable brace-style rule

* fix some spacing issues and add future rules

* add code suggestions

src/components/playback/playmethodhelper.js

@@ -9,14 +9,11 @@ define([], function () {
 
         if (session.TranscodingInfo && session.TranscodingInfo.IsVideoDirect) {
             return 'DirectStream';
-        }
-        else if (session.PlayState.PlayMethod === 'Transcode') {
+        } else if (session.PlayState.PlayMethod === 'Transcode') {
             return 'Transcode';
-        }
-        else if (session.PlayState.PlayMethod === 'DirectStream') {
+        } else if (session.PlayState.PlayMethod === 'DirectStream') {
             return 'DirectPlay';
-        }
-        else if (session.PlayState.PlayMethod === 'DirectPlay') {
+        } else if (session.PlayState.PlayMethod === 'DirectPlay') {
             return 'DirectPlay';
         }
     }