New version: ManifoldsBase v0.15.19

[JuliaRegistrator]

• Registering package: ManifoldsBase
• Repository: https://github.com/JuliaManifolds/ManifoldsBase.jl
• Created by: @kellertuer
• Version: v0.15.19
• Commit: 5972cde434c221009f354a229f7009856d4b0747
• Reviewed by: @kellertuer
• Reference: JuliaManifolds/ManifoldsBase.jl@5972cde#commitcomment-148138953
• Description: Basic interface for manifolds in Julia
• Release notes:

### Changed
* make `has_components` introduced in the last version a decorator trait function.

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