Make @codeCoverageIgnore annotations work on branch/path coverage

[dvdoug]

Hello @sebastianbergmann

Following on from #757, this PR allows lines of code to be ignored inside branch and path coverage.

Each branch contains the details of it's starting and ending lines in it's data, and these are compared against the lines that should be ignored. If a match is found, the details of the branch and any paths that the branch is part of are removed from the coverage data.

This should be the final stage of the plumbing work for #380 before work can start on the actual reports.

[codecov]

Codecov Report

Merging #758 into master will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #758      +/-   ##
============================================
+ Coverage     84.45%   84.51%   +0.06%     
- Complexity      881      888       +7     
============================================
  Files            40       40              
  Lines          2566     2576      +10     
============================================
+ Hits           2167     2177      +10     
  Misses          399      399              

Impacted Files	Coverage Δ	Complexity Δ
src/RawCodeCoverageData.php	98.90% <100.00%> (+0.13%)	51.00 <0.00> (+7.00)

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