Update v0.20

[h2]New Features[/h2] [list] [*] [b]Multiple Save Slots:[/b] In addition to auto-saving, you can now start and continue multiple distinct game sessions. [*] [b]Sector State Persistence:[/b] Resources you mine from asteroids in a sector will remain mined when you return to the same sector. [/list] [h2]Updates[/h2] [list] [*] [b]Updated Tooltips UI:[/b] The tooltips interface has been improved for clarity and usability. [*] [b]Font symbols for Chinese, Japanese, and Korean updated:[/b] These languages now have optimized characters for better readability. [/list]