Save System planning

[dimaguy]

Hey there, as we talked on discord, here's what the save system should be expected to do:

• on save, write to a file (the name should be the uuid of the player) all info of a player: name, stats, coordinates, completed missions(if one is ever coded)/achievements codes, other miscellaneous permanent variables (ongoing mission-exclusive variables should not be saved yet since it adds some complexity)

• on load, do the reverse, reset ongoing missions (assuming that we are talking about short storyline missions and not long item collecting missions)

• on reload, show a splash screen and load all variables, teleport the player to the new position listed in the save, load nearby assets, reload the ui with the new parameters and then exit the splash screen