(name 'Grease-Squeak6-Core-pmm.2' message 'Improve Squeak 6 Support

- move methods from GRPharoPlatform to GRSqeuakPlatform
- keep GRPharoPlatform as empty
- migrate from FileSystem to FileDirectory
- implement missing methods
- custom implementation of #openDebuggerOn:' id 'a32e7fbd-559a-4a6d-8442-57277c1ee178' date '16 July 2024' time '9:15:32.440636 pm' author 'pmm' ancestors ((name 'Grease-Squeak6-Core-cypress.1' message 'fabricated from a Cypress format repository' id '90a05819-76e9-4531-80d4-b8bde69d370f' date '15 July 2024' time '2:23:40.385068 pm' author '' ancestors () stepChildren ())) stepChildren ())