Fix for strict mode aka make it work in modules without breaking normal mode

[Dark-Bob]

Swapped out arguments.callee for a simple recursive call, so the script can run in strict mode ie: inside modules but it doesn't break running outside a module.

Usage inside a module:

import "https://code.jquery.com/jquery-3.2.1.js";
import "<path>/particles.js"

window.particlesJS("particle-canvas-green", {
            particles: {
                number: {
                    value: 100,
                    ...
});

Also added canvasResize and return the pJS object, so canvases can be resized explicitly. This can allow elements that are initially not displayed to host particles and then once they are displayed, we can call this and have the particles work as expected rather than occupy a 0x0 canvas.

import "https://code.jquery.com/jquery-3.2.1.js";
import "<path>/particles.js"

const particle_js_green = window.particlesJS("transition-particle-canvas-green", {
            particles: {
                number: {
                    value: 100,
                    ...
});

// Then on event
particle_js_green.canvasResize();

[matteobruni]

Duplicate of #194 and #65 but the project seems abandoned. Maybe an alternative?

[Dark-Bob]

Thanks Matteo, I'll leave it open since it has the canvas resize fix too but yeah if this repo is dead and I need to make any more improvements, I'll check yours out.