#136 "Errno"-like error handling in clients is replaced by error-signal emition

Fusionné

Viktor a fusionné 4 commits à partir de semlanik/feature_qgrpc_error_handling_108 vers semlanik/master il y a 7 ans

Auteur	SHA1 Message	Date
Viktor Kopp	18e4078dc4 Remove deprecated ÁbstractClient::lastError-functionality (#108)	il y a 7 ans
Viktor Kopp	a400a94f56 Async reply emits either error (failure) or finished (success) signals	il y a 7 ans
Viktor Kopp	9eff09f395 Emit AbstractClient::error signal on unattached channel	il y a 7 ans
Viktor Kopp	26a2bfb261 Introduce AbstractClient::error signal ( #108 #111 )	il y a 7 ans