Integration testing cleanup

[pyrodogg]

The goal is to keep the framework for integration testing but not require screeps-server-mockup by default. Instead, to instruct users how to install the dependency themselves.

• Adds instructions to install screeps-server-mockup and adding test scripts
• Removes test-integration script
• Removes integration from test script

[brisberg]

Should we remove the files under test/integration and make those optional too?

Right now they don't even compile without the screeps-server-mockup dependency.

[djD-REK]

Looks ready to merge to me :)

@brisberg I think the test files can stay, since you won't be running them without following the steps in the docs...

[djD-REK]

Alternatively, what would you think of just making the screeps-server-mockup dependency required for this package? Too much? 🔢

[pyrodogg]

@djD-REK Thanks for bringing this up again. I stalled when considering how much further it could go and forgot that the basic test script is currently broken on master.