Fix several issues for Linux around casting SDKManager to concrete class: mostly with reading devices.xml which Unix does not support. Migrated ISDKManager#getMinimumSupportedSBSv2Version() to API. Can now import and create Symbian projects.

bin.includes = META-INF/,\
               os/,\
               tcfPlugin.jar
jars.compiler.order = tcfPlugin.jar
source.tcfPlugin.jar = src/
output.tcfPlugin.jar = bin/