Allow creating "variables"

[mganchas]

Hey! Great work on Maestro 👌 Would be really useful if there was a way to set a collection of "variables" to reuse them in our tests.

For example:

appId: com.company.app
---

- variables:
   loginText: "Login to your account"

- assertVisible: $loginText
- tapOn: $loginText

Thanks!

[dmitry-zaitsev]

Looks nice, we will consider it

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