v2.9.0

f7b04c9 Support press Enter to add parameter and environment variable
f26078c Code refactoring
9766d7a Use string as session ID
59a0e4a func UniqueId: Reimplement
b39f5cf Fix icon of login page
a828a95 Fix bug: Environment variable not set correctly on web
28147c8 More convenient to add command parameters and environment variables

Precompiled:
rttys-linux-386.tar.gz
rttys-linux-amd64.tar.gz
rttys-windows-386.zip
rttys-windows-amd64.zip