Add flags for test/beta net explorer

[filipesmedeiros]

Still in tests

Removes a lot of non-technical stuff and leaves just the essential. All controlled by env vars :)

[dsiganos]

In general, you do want to have if statements checking if you are in testNet mode. You want to pass an object with context with any changing values and just use it, no if statements. I would say that if you are going to with if statements, then the if statement should be checking for liveNet, not for testNet.