T-Rex 0.19.0

• Add octopus algorithm (dev fee 2%).
• Load NVRTC library only when required reducing RAM footprint for non-ProgPoW based algorithms
• Remove --gpu-report-interval parameter, now GPU stats summary table is printed every 30s. Other cosmetic changes

NOTE: according to user reports CUDA 10.0 build is faster than CUDA 11.1 on octopus for 16 and 20 series cards.