Iesopt

Bug fixes in custom objective building, and better exception handling for log files.

Migrate full core component parameter docstrings.

Relax version requirements on IESoptLib to include all `v0.2.z` versions.

Fix solver setup for various workflows.

Changed

- `IESoptLib` and `HiGHS` are again required dependencies.

Added extensions to properly handle loading `IESoptLib` and various solvers.

Changed

- `IESoptLib` and `HiGHS` are no longer required dependencies.

Fixed

- Dynamic loading of weakdeps now works properly.

Added

- Initial public release of IESopt.jl