v0.5: Fixes update

Big fixes

• Im pretty sure i fixed most of the hosting weirdness like mac being unable to host and connections sometimes just freezing
• Fixed windows crashes that happened sometimes
• Made the server not get crashed by a client closing their application
• Added /help
• Made emojis and font work on mac
• Made offscreen text not render
• Added new shortcut, control delete to clear the text box
• Made /leave go back to selection screen not the username selection
• Made it so you can change username by pressing 4 in selection screen

Full Changelog: v0.4...v0.5