Fix GUI threading errors when clicking Navigate button

[sea-bass]

I think this finally fixes the annoying QBasicTimer error messages!!!

Closes https://github.com/sea-bass/pyrobosim/issues/194

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
__init__.py	0	0	100%
core
__init__.py	9	0	100%
dynamics.py	43	0	100%
gazebo.py	136	8	94%	55, 124, 230, 244–248
hallway.py	73	10	86%	59, 61, 63, 96, 158, 196–199, 205
locations.py	126	21	83%	53, 55, 69, 84–85, 87, 98–99, 101–102, 119, 177, 192, 217, 227, 273, 284–285, 287–288, 312
objects.py	69	4	94%	78, 106, 137, 197
robot.py	254	56	77%	151–152, 238, 251, 298, 312–313, 317, 321, 327–328, 330–331, 348–349, 377, 379–380, 401–402, 405–408, 411–413, 471, 477–478, 480, 482–485, 493–496, 507, 515, 521, 526–527, 530, 550–551, 558, 567, 570, 575, 588–592
room.py	48	1	97%	113
world.py	575	141	75%	146–147, 183–184, 188, 241–242, 244–245, 273–274, 325, 339–340, 342–343, 372–376, 378–380, 382–383, 386, 390–394, 397–399, 402–409, 440, 476–477, 480, 496, 526–527, 538, 541, 549, 565–569, 571–573, 576–577, 580–583, 585, 588, 590–592, 594–596, 598, 613, 620, 631–635, 670–671, 675–676, 694–695, 701–702, 704–705, 707, 709–710, 712, 714–715, 725–726, 729, 731, 745, 747, 754, 801, 832–833, 852–853, 857–858, 893–894, 896, 913–914, 933–937, 949–952, 964–967, 981, 992–993, 995, 1039–1040, 1092, 1172–1173, 1219
yaml_utils.py	106	11	89%	64, 68, 153–155, 159–160, 183–184, 208–209
gui
__init__.py	2	0	100%
main.py	187	34	81%	24, 26, 28–30, 32, 53, 85–86, 201, 213–217, 224–227, 229, 232–238, 242–244, 248–249, 260, 271
world_canvas.py	242	67	72%	41–43, 45–52, 55–62, 64–65, 73–74, 76–78, 153–156, 163, 165, 223, 261, 265, 318, 327, 333, 340–341, 343, 345–347, 350–353, 355, 359–364, 367, 370–371, 386–388, 391, 408, 451, 472, 476, 498
manipulation
__init__.py	1	0	100%
grasping.py	236	61	74%	102, 110–112, 114–122, 124, 132, 462, 464–466, 470–472, 566–568, 571–575, 583, 586–588, 593–594, 600–604, 607–614, 617–619, 628, 630, 632–638
navigation
__init__.py	3	0	100%
a_star.py	78	10	87%	67–72, 74–76, 165
execution.py	34	4	88%	45–46, 48–49
occupancy_grid.py	139	14	89%	44–47, 49–53, 56, 192, 226, 234, 238
path_planner.py	26	6	76%	33, 36, 38, 42, 85, 90
planner_base.py	59	31	47%	29–35, 51, 57–59, 86, 98, 101, 105, 113–114, 117–119, 122–124, 127, 129, 140–145
prm.py	72	56	22%	40–44, 46, 50–51, 54, 57–64, 66–67, 76–79, 85, 101–102, 104–109, 111–112, 115–118, 121–126, 135, 144, 154, 156, 158–159, 161, 174–178
rrt.py	172	7	95%	228, 353–354, 360–361, 363, 392
world_graph.py	70	3	95%	118, 121, 145
planning
__init__.py	0	0	100%
actions.py	70	47	32%	59–60, 62, 66–75, 77–80, 82–86, 88–91, 93–97, 99–102, 104–105, 107–109, 155–156, 159–163
planning/pddlstream
__init__.py	7	1	85%	13
defaultmappings.py	9	0	100%
planner.py	40	8	80%	119–126
primitives.py	57	2	96%	68, 208
utils.py	85	3	96%	66, 99–100
utils
__init_\.py	0	0	100%
general.py	33	4	87%	23, 45, 51–52
knowledge.py	144	16	88%	95–96, 105, 140–143, 150, 154–155, 168, 183, 187, 229, 245, 308
motion.py	60	6	90%	56, 67–71
polygon.py	111	0	100%
pose.py	89	2	97%	211, 227
search_graph.py	93	3	96%	240–242
trajectory.py	65	0	100%
TOTAL	3623	637	82%

Tests	Skipped	Failures	Errors	Time
172	0 :zzz:	0 :x:	0 :fire:	3m 33s :stopwatch: