v4.0.0 - Version 4 update!

👋 Aloha! Been a long time since a new release. This one isn't spectacularly crazy, but it does contain 100% breakage. Modello is no longer a static-based class, and instead is a traditional class that requires instantiation. Here's the work that's been done:

• Rewrote class to a traditional class (no static methods except ::parse())
• Constructor allows specifying path to views and cache at creation
• Updated regex in the conditional handlers to allow nested parentheses (this wasn't working before)
• Cache is now enabled by default (sensible default behavior)
• Updated documentation to reflect all features of the compiler
• Only the conditional and loop directives (@if () and @foreach ()) can have a space between the directive and the parentheses. This isn't true for @yield or @block anymore, as I'm trying to replace preg with str when I can.

And as a general status update, I do intend on making additional improvements as I start and continue work on some personal projects. Expect more features and improvements in the future! 😁