Lite Tweaks >> One Click Optimization

[Valtam]

I'm happy for someone to submit the code for this. I will then review and add it to Lite Tweaks.

Optimize will have to:

- Clear Memory
- Web browser Cache
- Log Archives
- Package Cache
- SystemD Log Cleaner
- Thumbnail Cache
- Trash Bin
- Whisker Menu

'One Click Optimization' button will have to go down the bottom next to Quit and Begin.

The 'At Start Up' and At Shut Down' options can be added in a later version.

Current Lite Tweaks code here - https://gitlab.com/linuxlite/litetweaks