Refactor ME line and MBT ME line

[fspindle]

• Work done on vpMeLine was done by FC
• During the tracking of a line we fill holes like for ellipses

[codecov]

Codecov Report

Attention: Patch coverage is 83.56941% with 58 lines in your changes missing coverage. Please review.

Project coverage is 54.12%. Comparing base (488b4bb) to head (66e7f8f).
Report is 19 commits behind head on master.

Files with missing lines	Patch %	Lines
modules/tracker/mbt/src/edge/vpMbtMeLine.cpp	72.64%	29 Missing ⚠️
modules/tracker/me/src/moving-edges/vpMeLine.cpp	89.21%	26 Missing ⚠️
...odules/tracker/me/src/moving-edges/vpMeEllipse.cpp	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1543      +/-   ##
==========================================
+ Coverage   54.01%   54.12%   +0.10%     
==========================================
  Files         441      442       +1     
  Lines       53865    53756     -109     
==========================================
  Hits        29095    29095              
+ Misses      24770    24661     -109     

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