Release notes for TrueType functions and PyPy support

[nulano]

Adds release notes for the following PRs released in 8.0.0 (#4764):

• Refactor font_getsize and font_render (Refactor font_getsize and font_render #4910); "Other Changes" section; for issues Vertical text alignment ignores yOffset #4553, Absent pixels when drawing font #4569, Incorrect vertical alignment of character when using fontmode = '1' #2293
• Implement anchor for TrueType fonts (Implement anchor for TrueType fonts #4930); "API Changes" section; for issues RTL Direction not having any effect #4511
• Add getlength and getbbox functions for TrueType fonts (Add getlength and getbbox functions for TrueType fonts #4959); "API Additions" section; for issues ImageFont module: getsize is slow? #4651, Font spacing changes #3977, font.getsize() changes after installing libraqm #4483, Obtain Character-Level Bounding Boxes of Generated Text #3921, Character bounding boxes and negative offsetx #4789; brief mention in "Other Changes" section for issue Vertical text alignment ignores yOffset #4553
• Add support for CBDT and COLR fonts (Add support for CBDT and COLR fonts #4955); "API Additions" section; for issues Is it possible to use colored Whatsapp/Facebook emoji? #3346, Error when using bitmap font embedded inside truetype font. #891
• Drop support for old PyPy versions (Drop support for PyPy3 < 7.2.0 #4964); "Backwards Incompatible Changes" section

I also listed the related issues for easier search.

[nulano]

Does MSYS2 fixes (#4890) need release notes?

[hugovk]

I think we can skip that one.