* First crack at RETRO_ENVIRONMENT_GET_POWER_STATUS
* First crack at RETRO_ENVIRONMENT_GET_POWER_STATUS
* Remove a stray comma
* Rename some symbols for clarity
* Change some references to the old environment call's name
* Fix some mixed-up cases in checking the power state
- I misunderstood the meaning of these enums
* Add a comment
* Rename seconds_remaining to seconds
* Clarify some comments about the power state
* Adjust power state behavior
- Don't return 0 seconds; instead, return NO_ESTIMATE
- Don't force percent to 100 in the CHARGED state
* Adhere to C89
* Mention the environment call in CHANGES.md
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