Formatting config

[LeafHacker]

Add Spotless build tasks to lint and format code. You can lint your code using spotlessCheck or format using spotlessApply.

I've added formatters for java, gradle, properties and some misc files like gitignore. The java and gradle formatters use eclipse's formatter which allows for a good amount of customisation.

Overview of style choices:

• Use tabs for indentation and spaces for alignment
• Most things (e.g. arguments and assignment) will try and align, up to a limit of 16 chars. I'm not sure if the number is max spaces to use in alignment or something else.
• Open blocks with brace on same line instead of a new line (e.g. try {)
• Allow short if statements to remain on a single line
  • Guard clauses like if (foo) return bar; can be single line (a guardian clause is a conditional return that guards against errors)
  • Other short if statements can too (configurable separately)
• Keep follow up statements on the same line as the previous closing brace (e.g. } else or } catch)
• Empty blocks contain no whitespace (instead of inserting spaces or newlines)
• Newline after annotations (couldn't figure out how to not break after short/single annotations)

See the format.properties file for the exact configuration and feel free to checkout of browse this branch to see how the the code looks formatted.

This fixes #23

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@ZeroMemes @0-x-2-2 Please leave feedback inline as part of your review, either commenting on the result of a setting or on the setting itself in format.properties. No rush to merge until all feedback has been addressed.

[0-x-2-2]

spaces over tabs but some stuff i would keep