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.
#Keywords for Carbide preferences
carbcPreference.common=carbide symbian c cpp cplusplus
carbcPreference.hoverhelp=hover help libraries developer