Make a gmt thin wrapper to reduce multiple recompilations.

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.33962% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.48%. Comparing base (216b769) to head (42f88b8).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/common_options.jl	94.59%	2 Missing ⚠️
src/gmt_main.jl	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1928      +/-   ##
==========================================
+ Coverage   85.39%   85.48%   +0.09%     
==========================================
  Files         187      187              
  Lines       27675    27687      +12     
==========================================
+ Hits        23633    23669      +36     
+ Misses       4042     4018      -24     

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