Belts now affected by quality.

minor fix for
https://mods.factorio.com/mod/belt-quality

Speed scaling formula: (XY+1)Z Where X is quality level, Y is scaling factor per level , Z is conveyor belt speed in items/s.

Examples(scaling factor = 0.3 or 33% per level):
Conveyor belt (common) - 15 items/s
Conveyor belt (uncommon) - 19,5 items/s ((10.3+1)15)
Conveyor belt (rare) - 24 items/s ((20.3+1)15)
Conveyor belt (epic) - 28,5 items/s ((30.3+1)15)
Conveyor belt (legendary) - 37,5 items/s ((50.3+1)15) P.S. Stepping from epic to legendary counts as 2 levels (quality.level) so x there equals 5.
Etc. with other belts.

To do list:
-Add compatibility to other belts mods.(Done)
-Add compatibility for loaders.(Partially done)
-Add an option to make underground belts max distance affected by quality. (Done)
-Make settings tab for mod(enable speed scaling,max underground distance scaling and their scaling factors in % etc.).(Partially done in 0.1.2 )
-Rework or enhance conversion system to work more stable and provide more user-friendly experience.(done in 0.1.0)
-Add a way to un-convert already converted belts.