retro-runner: Add trim_autosaves() and create_new_savestate_name()
Change generation method for manual savestates names Previously the names would be generated as "New savestate (nr_savestates+1)" Now the names are generated based on the existing names that have the same pattern. E.g. If we have savestates named "New savestate 1", "A", "B" and create a new manual savestate then it would be called "New savestate 2"
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