Restructured variables - moved FIR to own file

Restructured LESS variables and provided the ones DQs need.
Also moved FIR styling to their own .less file, merged the desktop /
mobile fir files into one _fir-round.less (because by default this
style is using the “round” fir option).
Merge branch 'master' of https://github.com/decipherinc/Respondent-View-Theme---Contemporary

Conflicts:
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