remove @BaseUrl and @DefaultHeaders decorators

[mjerez-radical]

This should be configurable at execution time

[auvipy]

any proposed solutions?

[M-jerez]

Yes, what i mean here is that using variables instead decorators might be a better approach, much more flexible and code would not need to recompile if URL or any header needs to be changed.

[0xE282B0]

@mjerez-radical what do you think about passing a function as @baseurl parameter like in PR #22 ?