Tidied up .btn class and button-reset mixin

Even though FMS has had a `.btn` class for a while, styling buttons has
still been difficult, mainly because of the very opinionated base styles
applied to overpowered selectors like `input[type="submit"]`.

This commit brings the FMS styles more in line with modern frameworks
like Bootstrap – inputs and buttons are left completely unstyled by
default, with an opt-in `.btn` class to add the styles back in.

Since `.btn` is just a single class, it’s easy to override, and avoids
selector bloat like `.green-btn, button.green-btn, input.green-btn`.

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