Adding Support.extra dofile & friends

[nicolasnoble]

• able to locate files nearby previously loaded files
• able to locate files inside .zip files

[ghost]

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[codecov]

Codecov Report

Attention: 134 lines in your changes are missing coverage. Please review.

Comparison is base (3db2564) 8.67% compared to head (533a2b9) 8.67%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
src/lua/extra.cc	12.79%	75 Missing ⚠️
src/gui/gui.cc	0.00%	33 Missing ⚠️
src/main/main.cc	35.71%	9 Missing ⚠️
src/lua/luawrapper.h	0.00%	6 Missing ⚠️
src/support/zip.cc	0.00%	5 Missing ⚠️
src/support/zip.h	0.00%	3 Missing ⚠️
src/support/version-linux.cc	0.00%	2 Missing ⚠️
src/gui/gui.h	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #1478    +/-   ##
========================================
  Coverage    8.67%    8.67%            
========================================
  Files         413      413            
  Lines      125907   126037   +130     
========================================
+ Hits        10923    10939    +16     
- Misses     114984   115098   +114     

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