Add dynamic loader for modifiers [draft]

[bzick]

Try create load-system on classes and autoload

Adding modifier

• All modifier stored in class as methods, like Fenom\Modifier class.
• Add class to Fenom storage: $fenom->addModifiersSource('Vendor\MyModifiers'). Second argument is boolean - append or prepend, by default prepend. Fenom do not parse class yet and do nothing with him. Just store.
• If need parse template starts parse stored classes by rules: modifiers name == methods name

good points:

• all modifiers autoloaded by user's rule
• if modifier is static method we cat put in template as is. Increase perfomance. bad points:
• add class manualy

[bzick]

Duplicate #27