Move some functions around and replace some calls to module names by gmt(...)

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.66787% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.03%. Comparing base (94ea35a) to head (b311e5f).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/marker_name.jl	95.58%	6 Missing ⚠️
src/histo_funs.jl	95.00%	5 Missing ⚠️
src/lepto_funs.jl	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1828      +/-   ##
==========================================
+ Coverage   85.97%   86.03%   +0.06%     
==========================================
  Files         170      173       +3     
  Lines       25906    25910       +4     
==========================================
+ Hits        22273    22292      +19     
+ Misses       3633     3618      -15     

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