1. fix wrong versionadded. 2. extract base session lexer ShellSessionBaseLexer.
1. fix wrong versionadded.
2. extract base session lexer ShellSessionBaseLexer.

sol/pygments,sol/pygments,sol/pygments,sol/pygments,sol/pygments,sol/pygments,sol/pygments,sol/pygments,sol/pygments,sol/pygments,sol/pygments,sol/pygments,sol/pygments,sol/pygments