Fixed the malediction of FlowMultiTools

• Upgraded Gradle version to 6.7
• Fixed the malediction of FlowMultiTools

Some fixes

• Code clarification
• Replaced '/' by File.separator

New Default URL Panel

• Passing to Gradle 6.6.
• JsonCreator will not use a file logger.
• Fix of bad '/'
• Fix of bad mcp generated json
• New Default URL Panel
• Added a warn on bad url
• Modified End Panel

Added size to External files

Added size to External files for progress callbacks in flowupdater

MCP & Ext files added

Reorganisation of packages
Added mcp & external files processors
Now, you can save the json file if it was not created.

1.0.0 : First stable release

Report bugs on https://github.com/FlowArg/FlowUpdaterJsonCreator/issues !!!