Rm unused gv funcs

[james-d-mitchell]

This PR removes the declarations of all functions not used outside of gv.gi from gv.gd and BIndGlobals them in gv.gi instead. Should only be merged after #121

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.40%. Comparing base (adb1bc5) to head (3dd8ca0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
+ Coverage   94.43%   96.40%   +1.96%     
==========================================
  Files          12       12              
  Lines        1223     1167      -56     
==========================================
- Hits         1155     1125      -30     
+ Misses         68       42      -26     

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