Add per paper support for controlling figure vspaces

[suyashmahar]

Right now every figure uses \vspace{-6mm} which is too much for visio drawings.

Template:

% Figure paddings:

%   \figtoppad
%       +------+
%       |Figure|
%       +------+
%   \figbottompad
%

\newlength{\figbottompad}
\newlength{\figtoppad}
\setlength{\figbottompad}{0mm}
\setlength{\figtoppad}{0mm}