Merge branch 'EAGLE_SF_update' into 'master'

doc/RTD/source/SubgridModels/EAGLE/index.rst

examples/EAGLE_ICs/EAGLE_12/eagle_12.yml

examples/EAGLE_ICs/EAGLE_25/eagle_25.yml

examples/EAGLE_ICs/EAGLE_50/eagle_50.yml

examples/EAGLE_low_z/EAGLE_12/eagle_12.yml

examples/EAGLE_low_z/EAGLE_25/eagle_25.yml

examples/EAGLE_low_z/EAGLE_50/eagle_50.yml

examples/EAGLE_low_z/EAGLE_6/eagle_6.yml

...solatedGalaxy/IsolatedGalaxy_feedback/isolated_galaxy.yml

...edGalaxy/IsolatedGalaxy_starformation/isolated_galaxy.yml

examples/parameter_example.yml

src/star_formation/EAGLE/star_formation.h