fix more import insufficiency
[deprecated] Use `DirEntry` constructor instead of `dirEntry` function
[deprecated] Use `std.algorithm.any` instead of `std.algorithm.canFind`
Reduce top-level imports in std.ascii
Reduce top-level imports in std.array
Reduce top-level imports in std.base64
Reduce top-level imports in std.bitmanip
Reduce top-level imports in std.complex
Reduce top-level imports in std.csv