v1.3.0 Update!

Yet another update, with some changes to make it work better with games that utilize delta time, and a small bug fix.

Here's the full changelog:

• Renamed "timer_set_pause" to "timer_pause".
• Added "timer_change".
• Added "timer_system_set_tickrate".
• Made it so if you set the tick rate to -1 the timer system runs independently from the frame rate, using milliseconds instead of frames.
• Fixed a crash that would happen if a room ended with a persistent timer while the instance didn't exist.

If you guys have any questions or suggestions, feel free to post them in the comments or just contact me via Discord.