[ALOY-525] Add support for new tag to group many blocks of XML code together easier

Right now, if you have a set of XML code in your view that needs to be conditionally executed (either platform, formFactor, etc) you have to add the same logic on each tag in the group or be forced to wrap in a View tag. Wrapping in a view tag is as performant on certain platforms like Android where the view hierarchy depth is sensitive / limited. I'd like to introduce a new tag (IF) that will make this much easier and more capable of performing more dynamic structures. This should support both the existing conditionals: platform and formFactor. I'd like to also introduce a cond attribute whereby you can add additional JS logic or variable which which be used to evaluate the block.