add avoidObstacles system

[Henrybk]

Ready for testing / review

Reworked my old plugin to use config.txt key, dynamic route_step for obstacle avoidance, rich configuration.

Still needs more work

V1: https://youtu.be/82owECOWyXA

V2: https://youtu.be/3H4T1wneXaE

V3: https://www.youtube.com/watch?v=TeB6qx2pg5c

V4: https://www.youtube.com/watch?v=cMHPemgh4iw

V5: https://www.youtube.com/watch?v=QROjEMqUw1k&t=12s

V6: https://www.youtube.com/watch?v=ik8CJaTEbtQ

This is actually making me rework a bit of the pathfinding algorithmn, the route logic and the position calculation logic.

Implemented a new function to calculate the character position, this are the test results:

This first test is the comparison between the prediction of old and new methods at the movement a movement packet arrives, so it is basically a check to see if we are calculating right.
The old function had a 75.53% correctness rate over 2624 moves, with an average error of 0.245 cells
The new one has a 99.77% correctness rate with an average of 0.002 cells of error

Character Moves
---------------
Events processed              2624
Avg walk speed               0.150

Exact Match Summary
-------------------
Old exact                      1982 (75.53%)
New exact                      2618 (99.77%)
Both exact                     1978 (75.38%)
Both wrong                     2 (0.08%)
Old exact only                 4 (0.15%)
New exact only                 640 (24.39%)

Block Distance Summary
----------------------
Old closer                     4 (0.15%)
New closer                     640 (24.39%)
Equal distance                 1980 (75.46%)
Avg old block distance         0.245
Avg new block distance         0.002

Adjusted Block Distance Summary
-------------------------------
Old closer                     4 (0.15%)
New closer                     640 (24.39%)
Equal distance                 1980 (75.46%)
Avg old adjusted distance      0.300
Avg new adjusted distance      0.002

And this is the same comparison, but made at the movement a movement packet is sent, instead of when it arrives, so we are kinda predicting the future here, so it won't be exact.
Old one had a 15.23% match rate with avg error of 0.860 cells
New one has a 57.31% match rate of avg error of 0.427 cells

Route SetMove
-------------
Events processed              2600
Avg walk speed               0.150

Exact Match Summary
-------------------
Old exact                      396 (15.23%)
New exact                      1490 (57.31%)
Both exact                     396 (15.23%)
Both wrong                     1110 (42.69%)
Old exact only                 0 (0.00%)
New exact only                 1094 (42.08%)

Block Distance Summary
----------------------
Old closer                     0 (0.00%)
New closer                     1127 (43.35%)
Equal distance                 1473 (56.65%)
Avg old block distance         0.860
Avg new block distance         0.427

Adjusted Block Distance Summary
-------------------------------
Old closer                     0 (0.00%)
New closer                     1127 (43.35%)
Equal distance                 1473 (56.65%)
Avg old adjusted distance      1.057
Avg new adjusted distance      0.514