V0.2.1 Cleanup packages and separate solver

[RuaridhMacd]

Description

This PR includes the following:

• Removed unused packages
• Separated Gurobi and CPLEX from Dolphyn. HiGHS is now the default and the others must be added separately in the run file and global_model_settings.yml. This is not a breaking change in how the code runs, but Gurobi, CPLEX, etc. must be added separately.
• Added HiGHS settings to NorthSea example.
• Fixed incorrect settings in HIGHS default config.
• Created run_tools to simplify run files
• Updated documentation for the examples
• Updated the README with instructions for how to install DOLPHYN

Fixes issue #

No associated issue

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.

• Example_Systems/SmallNewEngland/OneZone
• Example_Systems/SmallNewEngland/ThreeZones

Test Configuration:

• OS: Mac Sonoma
• Solver: Gurobi and HiGHS
• Julia version: 1.6.7 -> 1.9.3
• Solver version: Gurobi 10.0, HiGHS 1.6.0

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have run tests with my code to avoid compatibility issues
• Any dependent changes have been merged and published in downstream modules