[axl_sl] added m_argIdx member field.
[axl_sl] added m_argIdx member field.

this allows for more natural re-parsing of the values. for example, on windows we may want to replace leading '/' with '-' and re-submit to processArg (previously we had to also pass some random arg idx)

vovkos/axl,vovkos/axl,vovkos/axl,vovkos/axl