Implemented possibility of helpers for "control" macro
Latte: PhpWriter: added support for indexed arguments (%1.raw)
Latte: added native support for empty macros with slash {name /} (BC break)
Latte: fixed macro {label /}, slash is processed native
Latte: optimized code generated by {form}, {formContainer}, {label}, {input} and n:input
Latte: added support for {input name:$key} and {label name:$key} (inspired by @hrach) [Closes #416]
Latte: removed side effect, PhpWriter::write() do not advance tokenizer
typos