Move algebra into helpers/
Add a gametime property to all models

It does not change when game is paused (it does,
but only by ~20ms, bug in easel I guess)
Add a weapon cooldown, so you can’t shoot an infinite amount of bullets
Move gametime property to Bullet for now

Don’t know where to place it properly, if at all.
Go over to radians from degrees

This is because the math functions takes radians,
less conversion this way… and a new way to think.
Always round off Point.x,y to nearest 2 decimals
Add length and angle to Point (getter and setter)
Don’t think this check is really necessary
Make math consistent