fix for 813
remove warning
1168 - use ide backend for OTP libraries, if same version
fix erlide_open:get_lib_dirs
use Guava's Future implementation
small fix
rpc: use executors for async calls
remove unused RpcEventProcessor
change rpc tieout type to 'long'
simplify createing rpc threads
small optimization for externals content provider
fix stupid typo error
fix stupid typo error
prepare v0.20.3
Merge branch 'master' into pu