[TASK] Adapt SetCdc API changes

 - Update std::string QString member in DialogOpenCdc.

Signed-off-by: Ramakrishnan P <ramakrishanan_p@kalycito.com>
[FEATURE] Handle critical errors from the stack

 - Introduce critical error signals to the application

Signed-off-by: Ramakrishnan P <ramakrishanan_p@kalycito.com>
[FEATURE] Handle critical error signals from the stack

Signed-off-by: Ramakrishnan P <ramakrishanan_p@kalycito.com>
[TASK] Add NMT command for local node to the stack.

Signed-off-by: Ramakrishnan P <ramakrishanan_p@kalycito.com>
[TASK] Adapt changes for the NMT command for remote node.

Signed-off-by: Ramakrishnan P <ramakrishanan_p@kalycito.com>