Improve docs

Add Clamp() function

Improve LogHelper to log the proper caller function of LogHelper

Add slicesx.SortByPropValueOrder() func

Add slogx package to main readme

Add slogx package and logger helper

Extend OpCache with Set operaiton

Extend OpCache with Clear and Remove operations

Simplify and modernize code

Extend OpCache to execute initial execOp() once

Rename vars for clarity

Add Protect and Retry functions

Improve docs

Improve gox examples

Format sources