Cleanup Gleez_Template

Hi @sandeepone

I have many of small fixes and code optimizations for `Gleez_Template`. But initially, I needed you to apply this pull request.

Here only minor changes:
* Converted all whitespaces to tabs
* Deleted trailing spaces

and no other changes

*All this is necessary in order to better track changes in the future and see in the future only the constructive addition and changes.*