Deprecating gfxdraw module

[mzivic7]

These functions must be implemented to pygame.draw module in order to deprecate pygame.gfxdraw module:

• [X] #2800
  • [X] thickness
  • [X] filled
• [X] draw.aaline
  • [x] #3140
• [X] draw.aalines
  • [x] #2912
  • thickness *
• [ ] #3016
  • [ ] thickness
  • [ ] filled
• [ ] #3126
  • [ ] filled
  • thickness *
• [ ] draw.textured_polygon
• [ ] #3009
• [x] #3008
• [ ] #3010 (deprecation warning + notice in the docs)

Each aa- function should be interchangeable with regular function, in terms of arguments and capabilities.

* - this feature is hard to implement or will be very CPU intensive

gfxdraw can be deprecated after implementing all above listed main functions, and it gets removed in pygame-ce 3 or later. Thickness and filled features are still very important.

Deprecating gfxdraw closes:

• #2463
• #2450
• #2082
• #1728
• #1487
• #679
• #586
• #172