WebUI 1.4

Looks like I broke the custom server interface with the previous update (whoops!), this update fixes that.
This also fixes an issue with the update checker code being triggered multiple times. (double whoops!)

• Added a update checker.
• Added an option to specify additional parameters. (Defaults to: --fake-internet)
• WebUI functions can now be called from JavaScript via XMLHttpRequest. (Limited to certain user-defined functions.)
• WebUI now simulates multi-threading via using an additional process to handle tasks.
• More bug fixes.

• You can now set a login. (Useful If you're running WebUI on an open port.)
• You can now double click a custom server entry to edit it.
• The UI will now update more smoothly. (Using XMLHttpRequest instead of reloading the page.)
• Bug fixes.