Font tweaks

[andrzejnovak]

• Fix spacing between "CMS" and "additional label" to ~1 space

• Set "CMS" font size to 1.3* the font size of the "additional label"
• Either use Helvetica or better yet, use Tex Gyre Heros which is free and we can package it so it's accessible regardless of using mac/win/linux

[anmalara]

1. yes, I wanted to fix this already. it's not super trivial since I couldn't find a way to get the width of the CMS text (if you know how, it would be helpful)
2. At the moment it was set to 0.75 of the CMS font. I can bring it to 0.7 if you like. We should decide also on the size of the lumi text (0.60 at the moment). Do you also want to have this fixed and hidden for the end-user or still with the possibility to modify it?
3. Fine for me, but not sure how to add it to the TLatex. These are the current fonts available (https://root.cern.ch/root/html534/guides/users-guide/ROOTUsersGuideChapters/Graphics.pdf#page=43)

[IzaakWN]

• yes, I wanted to fix this already. it's not super trivial since I couldn't find a way to get the width of the CMS text (if you know how, it would be helpful)

This is related to #8 (comment) where I offer a solution.

Alternatively, there are these methods: TLaTeX::GetBoundingBox, TLaTeX::GetXsize, but I never tried it...

[anmalara]

spacing fixed in #15