Add a native `_dynamic` attribute support in EnderCompiler

[0xENDER]

So EnderCompiler will check the syntax of the dynamic data, and the data can be put anywhere in the element.
So this:

<div id="element" @@(rule)(unload)>...</div>
<div _dynamic="name1">...</div>
<div @@(defineder)(name2) @@(rule)(constant)>...</div>

Would be compiled to:

<div id="element" _dynamic="@@(rule)(unload)">...</div>
<div _dynamic="name1" >...</div>
<div _dynamic="@@(defineder)(name2) @@(rule)(constant)">...</div>