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 = plugin.xml,\
               META-INF/MANIFEST.MF,\
               .

jars.compile.order = .
source.. = src/
output.. = bin/