Make backend wrappers more uniform

[egede]

The backend wrapper scripts for different backends are different for no good reason.

• Local: https://github.com/ganga-devs/ganga/blob/develop/ganga/GangaCore/Lib/Localhost/LocalHostExec.py.template
• Batch: https://github.com/ganga-devs/ganga/blob/develop/ganga/GangaCore/Lib/Batch/BatchScriptTemplate.py.template
• Condor: https://github.com/ganga-devs/ganga/blob/a053267c3e8ffa1c6e4adb685c5ae49a66eed9ea/ganga/GangaCore/Lib/Condor/Condor.py#L396

Some differences may have to remain, but for sure there can be some consolidation.

[egede]

@ishanrai05 Is this something that you will be able to take a look at?

[ishanrai05]

I am working on this.