Log Utils 0.4 - Migrate from static to instance loggers

[Jonathing]

This PR migrates Log Utils from the static Log class to the traditional Logger instance loggers. Here's my plan for this:

• Deleting Log, since everything is going to be instance-based now. There's no real way I can preserve it without basically duplicating the entire project.
• Interface Logger will define the contract for consumers using loggers.
• Abstract class AbstractLogger defines the simplest implementation of a basic logger, only having method log(Logger.Level, String) to override and the base implementation handles the rest.
  • Abstract logger can be created with an initial enabled log level (defaults to INFO) or indentation level.

This one was based on a suggestion from @LexManos. My original intention behind the single static Log was for simplicity and performance, but since every god damn logging framework is instance-based (including Java's), there's no real point if we need to have instance loggers anyway.

The only thing I haven't done yet are log tags, like prefixing messages with [Mavenizer] or something. I don't think it would play nice with the indentation system, so we'd likely have to choose between either that or the indentations.