LMW-168 Add templates to style more form elements

Refers to LMW-168

Adds a set of spacing classes with the !important flag if requested by appending --important to the class name. Needed to override a specifically annoying bit of specificity.

Adds form_checkboxes component and styles that and radios appropriately so vertically spaced as well as horizontally look good.

Adds various templates for the events form.