Automatic alignment of y-axis wherever present

[bharat-mukheja]

In Line, Multiline, Heatmap and any other graph wherever a Y-axis is present, the alignment of the axes should be done with respect to the left-most pixel of the axis. The current "margin" gives the option to manually align the graph with respect to the first pixel of the label. But, label names can vary in length by a lot(string size could be - 2 to 50+), and hence a margin with respect to name can be counter-productive.
Instead, a better version is for the margin to work with respect to the y-axis, and align the labels automatically(wrap or decrease size).
Same goes for x-axis.

[nxanil]

@bmukheja

Done and make PR #662. Please have a look

[bharat-mukheja]

@nxanil - Can you check my comment on the PR. There is still a bug on this.