Refactor type parameters

[samufi]

Often we use short type parameters such as T or lowercase type parameters. These should be changed to meaningful names and to PascalCase

[mlange-42]

Agree only partially here. Signatures that use parameters are partially long and hard to read already. So I think where a parameter is relatively clear, like collection element type, queried components, etc., names like E, T or C are sufficient and keep signatures more readible.