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Add objects to scene in Blender 2.80

Blender 2.80 introduces a new feature of collections, which (in my opinion) is a very important for various purposes like grouping objects, selectively enable / disable in view port, etc.

Accordingly, the codes also needs to be updated in 2.80 for adding an object to the active scene. From the documentation (https://wiki.blender.org/wiki/Reference/Release_Notes/2.80/Python_API/Scene_and_Object_API),

Install external python packages + virtualenv with Blender

Requirements: Blender 2.80+ (2.79 should also work with pip method, not tested thoroughly)

Step 1: Install virtualenv on the system

In order not to mix the packages installed for Blender (such as scipy, matplotlib) with those system-wide packages, we need to create a virtual environment for the Blender alone.

Best practice is to use a single virtualenv for each version of

	import subprocess
	import sys
	import os
	import json
	import shutil

	import requests
	import opentimelineio as otio

	# -- coding: utf-8 --

	# ##### BEGIN GPL LICENSE BLOCK #####
	#
	# This program is free software; you can redistribute it and/or
	# modify it under the terms of the GNU General Public License
	# as published by the Free Software Foundation; either version 2
	# of the License, or (at your option) any later version.
	#
	# This program is distributed in the hope that it will be useful,

	def get_anim_datas(context=None):
	if context is None: context = bpy.context
	found = set()
	materials = set()
	textures = set()

	def found_add(o):
	if o is None: raise Exception()
	found.add(o)
	found_add(context.scene)

	# -- coding: utf-8 --

	# ##### BEGIN GPL LICENSE BLOCK #####
	#
	# This program is free software; you can redistribute it and/or
	# modify it under the terms of the GNU General Public License
	# as published by the Free Software Foundation; either version 2
	# of the License, or (at your option) any later version.
	#
	# This program is distributed in the hope that it will be useful,

	import os
	import sys
	import bpy

	output = None
	input = None
	info = None
	error = None
	write = None

	#import the bpy module to access blender API
	import bpy

	#WARNING: this is written and tested for blender 2.79
	#blender 2.8 and newer will likely have a different python API

	#create a property group, this is REALLY needed so that operators
	#AND the UI can access, display and expose it to the user to change
	#in here we will have all properties(variables) that is neccessary
	class CustomPropertyGroup(bpy.types.PropertyGroup):

	import bpy

	def do_bake(scene):
	""" This thing tries to bake all the object animations
	and camera movement into a single track

	Drawback: it eleminates scenegraph hierarchy and flattens everzthing

	This suposed to be it, but fingers crossed:
	https://wiki.blender.org/index.php/Dev:2.4/Source/Animation/AnimationBaking

	import bpy
	import json
	import os


	class DataCombiner(object):

	def __init__(self, path_to_renders, path_to_groundtruth):
	self.path_to_groundtruth = path_to_groundtruth
	bpy.data.scenes['Scene'].render.filepath = path_to_renders