Support logical operators in HTML Template code

[jankapunkt]

I often have much redundancy when just trying to pass conditional paramters. For example:

{{#if condition}}
  {{> otherTemplate param=1}}
{{else}}
  {{> otherTemplate param=2}}
{{/if}}

alternative would be now to create another helper (because condition is shared, which I can't simply return the value from this helpert) but that increases the js code a lot for many simple conditions.

Way better would be

{{> otherTemplate param=(condition ? 1 : 2)}}

That would also make many custom Template helpers packages obsolete and thus again reduce bundle size.

Any ideas or ciritcs on that?

[filipenevola]

LGTM