Allows users to enable/disable tor from the config menu, which will
forward all requests through Tor.
Also adds support for setting environment variables for alternative
proxy support. Setting the following variables will forward requests
through the proxy:
- WHOOGLE_PROXY_USER (optional)
- WHOOGLE_PROXY_PASS (optional)
- WHOOGLE_PROXY_TYPE (required)
- Can be "http", "socks4", or "socks5"
- WHOOGLE_PROXY_LOC (required)
- Format: "<ip address>:<port>"
See #30