[Ctypes] TVB-2719 Add ability to specify if faces' vertices are 1-indexed

[ayan-b]

Closes #41

This is on top of #40

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (trunk@af53f95). Click here to learn what that means. The diff coverage is n/a.

@@           Coverage Diff            @@
##             trunk      #44   +/-   ##
========================================
  Coverage         ?   86.79%           
========================================
  Files            ?        1           
  Lines            ?       53           
  Branches         ?        0           
========================================
  Hits             ?       46           
  Misses           ?        7           
  Partials         ?        0           

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update af53f95...b2e18ab. Read the comment docs.

[liadomide]

This will need to be merged after PR #40 as it relies on those changes in the implementation.