Remove remaining Jetty dependencies in susimail

[zzz]

Our webapps should depend only on javax.servlet, not Jetty classes. Jetty dependencies cause trouble when we update Jetty, and prevent people from running the webapps under other web servers.

I2psnark dependencies on Jetty were removed in 2013 at great effort. Other than routerconsole, which must depend on Jetty since it starts it, the only webapp with remaining dependencies is susimail.

Most is already done; form processing classes (MultiPartRequest? et al) were copied out of Jetty 6 and bundled with susimail when we moved to Jetty 7.

What remains (search for 'eclipse') is only MultiMap?. Unfortunately MultiMap? requires other Jetty utils so I punted in the port to Jetty 7 and left it in.

Either write a compatible MultiMap? (preferred) or copy the required sources in to susimail.

[wockenfuss]

• reimplemented needed MultiMap? functionality in local class
• file upload tested and working
• only depends from i2p.jar and javax.servlet.jar now

[str4d]

Pushed in rev af7c845be25ea12beb088402474476862c7d28c7

Thanks wockenfuss!

[zzz]

fix up build.xml in 5afe57cebc4f97706dabceeaca229c78666ee003