v0.18.0 released

* New Argon2d algorithm (argon2d-dyn only)
* Support MTP and Cuckaroo29 on NiceHash
* Make API more compatible with ccminer API
* Support mining Aeternity on GPUs with 2 GB of memory (Linux only)
* Support mining Cuckaroo29 on GPUs with 4 GB of memory (Linux only)
* Indicate activity to suppress auto sleep mode (Windows only)