Fix recursive escaping

[o-sdn-o]

Changes

• Fix recursive escaping (Nested quotation). command-line:

  vtm -t -c "<config/term/sendinput=\"vtm -t -c \\\"<config/term/sendinput=\\\\\\\"echo \\\\\\\\\\\\\\\"test\\\\\\\\\\\\\\\"\\\\\\\"/>\\\" -r term\"/>" -r term

  command-line:

  vtm -t -c "<config/term/sendinput='echo \'test\''/>" -r term