It is any DS2482 I2C to 1-Wire bridge functional library?
I guess to solve the first error, you also need this library, which contains the DallasTemperature.h file. The file get's included, but is not contained in the DS2482 library. Unfortunately there is no clue for that in the readme of the library. The author didn't commit anything since 2014, so the development of the library can be considered dead from that side. Though some people have forked the library to make little changes.

And the solution to the second error is described in this issue of the DS2482 library (just adding an include of "Arduino.h" in the OneWire.cpp file).