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[E2] Particle Core

Adds in particle functionality to Expression 2.
Reupload to workshop.

Thanks to 343N (Malcolm Turnbull) for updating and fixing parts of the code to reduce the footprint of the extension and to minimize crashes.

Function list: (NOTE: I honestly can't be bothered right now to get all the arguments here, but everything is fully explained in E2helper.)

- particleSetStartSize: Sets the size of the particle at creation (Default: 16)
- particleSetDuration: Sets the particle duration (Default: 1)
- particleCreate: Creates a particle with previously defined settings. (All settings are persistent)
- particleSetVelocity: Sets the particle's velocity upon creation, independent from gravity. (Default: 0, 0, 0)
- particleSetStartAlpha: Sets the Alpha of the particle at creation (Default: 255)
- particleSetColor: Sets the particle color (Default: 255, 255, 255)
- particleBounce: Sets the bounciness of particles. (Default: 0.3)
- particleSetEndSize: Sets the size of the particle at deletion (Default: 16)
- particleGravity: Sets the gravity of particles. (Default: 0, 0, -9.8)
- particleCanCreate: Returns 1 when particle() will successfully spawn a particle until the limit is reached.
- particlesList: Returns an array of material paths for use with particle functions.
- particleSetEndLength: Sets the length of the particle at deletion. MUST BE SET AFTER SETSIZE. Length always points towards direction of velocity. (Default: nil)
- particleCollision: Enables or disables particle collision. (Default: true)
- particleSetPitch: Sets the particle's pitch (Default: 0)
- particleSetPosition: Sets the particle position (Default: 0, 0, 0)
- particleSetStartLength: Sets the length of the particle at creation. MUST BE SET AFTER SETSIZE. Length always points towards direction of velocity. (Default: nil)
- particleSetEndAlpha: Sets the Alpha of the particle at deletion (Default: 255)
- particleSetMaterial: Sets the particle material path (works with PNGs now!)
- particleSetMaterialList: Sets the particle to use a list and select a random material from it, use an array of path strings.