various improvements for commands about sync / preview files

[EvanBldy]

Problem

• When syncing from another instance we don't test if the file is already here.
• All commands with target parameter should be renamed to source.
• For sync_full_files the filenames are the same for different prefix wich leads to overwriting file in multithreading.
• For generate tile we can't filter by project / assets or shots and we don't have any progression.

Solution

• When syncing from another instance test if the file is already here.
• All commands with target parameter should be renamed to source.
• For sync_full_files fix filenames wich leads to overwriting file in multithreading.
• For generate tile add : filter by project / assets or shots and progression.