Fix T98902: Btracer Particle Trace is broken

Problem has been introduced after python 3.10 upgrade
This patch explicitly casts input parameters to int

Maniphest Tasks: T98902

Differential Revision: https://developer.blender.org/D15225

btrace/__init__.py

@@ -4,7 +4,7 @@
 bl_info = {
     "name": "BTracer",
     "author": "liero, crazycourier, Atom, Meta-Androcto, MacKracken",
-    "version": (1, 2, 3),
+    "version": (1, 2, 4),
     "blender": (2, 80, 0),
     "location": "View3D > Sidebar > Create Tab",
     "description": "Tools for converting/animating objects/particles into curves",

btrace/bTrace.py

@@ -303,9 +303,9 @@ class OBJECT_OT_particletrace(Operator):
                 spline = tracer[0].splines.new('BEZIER')
 
                 # add point to spline based on step size
-                spline.bezier_points.add((x.lifetime - 1) // particle_step)
+                spline.bezier_points.add(int((x.lifetime - 1) // particle_step))
                 for t in list(range(int(x.lifetime))):
-                    bpy.context.scene.frame_set(t + x.birth_time)
+                    bpy.context.scene.frame_set(int(t + x.birth_time))
 
                     if not t % particle_step:
                         p = spline.bezier_points[t // particle_step]