Code reference and test case id logic update

[HardNorth]

Justification: source value inside item attributes contains full path to a .robot file. That means on different machines (E.G. locally and on server) it will have different code_refs. That will lead to different Test Case IDs, therefore same tests will not be displayed in history if they run on different machines. Another issue here is that if we use a popular extension DataDriver we will get a code_ref which is missed in the source file. E.G. a line like this: Login with user '${username}' and password '${password}' will be transformed into line like this: Login with user 'User' and password 'Password'.

So the patch does:

• Makes paths relative in code references and Test Case ID
• Forces code_refs to match original code line
• Still uses formatted test name for Test Case ID to avoid history collisions.

[codecov-commenter]

Codecov Report

Merging #119 (b10dc16) into master (82285df) will increase coverage by 0.45%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
+ Coverage   73.04%   73.49%   +0.45%     
==========================================
  Files          10       10              
  Lines         523      532       +9     
==========================================
+ Hits          382      391       +9     
  Misses        141      141              

Flag	Coverage Δ
unittests	73.49% <100.00%> (+0.45%)	:arrow_up:

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Impacted Files	Coverage Δ
robotframework_reportportal/model.py	100.00% <100.00%> (ø)

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