[Savestates] Add temporary savestates to /record and /play

[ScribbleTAS]

In preparation for #190, /record will now create a temporary savestate that will be loaded in /play.

Temporary savestates will not show up in the list of savestates but can be seen in saves/savestates/worldname-Savestates/worldname-SavestateTemp
To make this savestate visible, a change to the tas/savestate.json is needed:

// Stores savestate related data
{
  "index": "3", <--- Index needs to be added
  "date": "1760819581",
  "name": "Temporary Savestate!"
}

They will also be overriden after using /clearinputs and /record once again

An optional argument nosave can be added to /record and /play that will skip the creation/loading of the savestate.

Fixes

• Fixed an issue where the Renaming gui would not rename the currentsavestate (The savestate.json in the saves/worlname folder)