Use autoload rather than depend on wp-top12

[bobbingwide]

It should be possible to run slog and slog-bloat without wp-top12.

Requirement

slog and slog-bloat to be mostly standalone

Proposed solution

• [ ] Implement oik_autoload
• [ ] Remove calls to oik_require for files from wp-top12
• [ ] Convert slogadmin* functions to class Slog_Admin