[#73270928]add "validation states" related file

new file: _variables.scss
updated related files
update 'validation states

- fix scsslint error
- tweak styles of form controls
- replace with adequate icon fonts
fix conflict in merge
Merge branch '73270920supported-controls' into 73270928validation-states
Merge pull request #33 from gengo/73270928validation-states

[#73270928]validation states
Travis build 151