Moving cache variable to template instead of in the struct.

This makes the code more strict since you can't assign or compare
values of different types without proper cast.

- Unified/Inline Diff-View Selectable

This commit improves templates readability, since all of them use consistent
indent with all template command blocks indented too.

1. Indents both HTML containers such as <div>, <p> and Go HTML template blocks
   such as {{if}} {{with}}

2. Cleans all trailing white-space

3. Adds trailing last line-break to each file