Use new xp-framework/reflection library

[thekid]

See https://github.com/xp-framework/reflection. Includes support for PHP 8 idiomatic attributes as described in #40.

Comes with a slight performance hit and a memory increase in PHP 7:

Before

$ xp test src/test/php/
# ...
♥: 492/499 run (7 skipped), 492 succeeded, 0 failed
Memory used: 7290.74 kB (8016.17 kB peak)
Time taken: 0.141 seconds

Roughly the same with PHP 7.4

After

$ XP_RT=8.0 xp test src/test/php/
# ...
♥: 492/499 run (7 skipped), 492 succeeded, 0 failed
Memory used: 6925.93 kB (7723.36 kB peak)
Time taken: 0.145 seconds

$ XP_RT=7.4 xp test src/test/php/
# ...
♥: 492/499 run (7 skipped), 492 succeeded, 0 failed
Memory used: 9717.46 kB (9730.16 kB peak)
Time taken: 0.178 seconds

[thekid]

Library has reached 0.7.0 - https://github.com/xp-framework/reflection/releases/tag/v0.7.0, require at least 1.0 for merging!

[thekid]

Require at least 1.0 for merging!

Library has reached 1.0.0 - https://github.com/xp-framework/reflection/releases/tag/v1.0.0 ✅

[thekid]

Implemented as part of a completely new library without the need for all the legacy support, see https://github.com/xp-framework/test