Update css variable names, update ellipsis on shorter width inputs

[awidener3]

• Updated css variables to be prefixed with semanticForms (i.e. --semanticFormsFontFamily)
• Input label ellipsis are now responsive to the input width.
• Appearance can be updated via the css variables.
  • Note: this will require the semantic-forms css files to be linked prior to any user css.

/* some styles... */

form.semanticForms {
  /* will overwrite the default semantic-forms values */
  --semanticFormsFontFamily: monospace;
  --semanticFormsTextColor: blue;
  --semanticFormsInputMinWidth: 300px;
  ...
}