new module testlinkargs and factory decoMakerApiCallWithArgs() #8

module testlinkargs is used as a 'singleton' to register the supported
TestLink API methods and there (positional and optional) arguments
- replace testlinkapigeneric.positionalArgNamesDefault

new decorator factory decoMakerApiCallWithArgs() 
- realize, that the decorator decoApiCallWithArgs could register API
methods and there arguments with new function
testlinkargs.registerMethod()