Reorganize

[K20shores]

Closes #61 and #65

• adds several new github actions
• prefixes all cmake options with musica_
• changes the fortran interface so that the config path is called on construction
• reorganizes the cmake files so that the top level project is called musica-distribution in the style of the google test cmake files, with src and fortran adding new projects
• renames folders to remove redundancy
• removes musica core dependency
• updates install instructions to go to normal places so we don't need to symlink things
• creates actions files for unbuntu and mac for both c/c++ and fortran. Windows only has the c/c++ interface becuase I'm too lazy to figure out the fortran build there. It is likely only possible with mingw

[mattldawson]

looks great! this was a lot of work! just a couple minor questions