WebParser: Modified proxy handling

- Added new proxy setting switch: /auto, /none
 /auto: use IE setting
 /none: direct connection

Example:
 ProxyServer=/none

- Added global proxy setting. If proxy setting is defined in Rainmeter.data, use it as a global proxy. Default value is /auto.

Example:
 [WebParser.dll]
 ProxyServer=example.net:8080

If ProxyServer= is not defined or is empty string in WebParser measure, use a global proxy. If an individual proxy setting is defined in WebParser measure, use it instead of a global proxy.