Prevent the dependencies of users' projects from messing up with Pitest

[echebbi]

Closes #74 by putting Pitest's JARs first in the classpath, and project's dependencies second. I don't know exactly why it solves the issue, but according to my tests it works as expected.

Important: I'm going to merge this PR & release a new version so that users can test whether the fix works for them as well. If it does, we really need to add a new test where Pitest is run on a project that depends on ASM to prevent future regressions.

Note: this solution has been inspired by this issue in Pitest's repository

[codecov[bot]]

Codecov Report

Merging #108 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #108   +/-   ##
=========================================
  Coverage     84.86%   84.86%           
  Complexity      298      298           
=========================================
  Files            45       45           
  Lines          1242     1242           
  Branches         88       88           
=========================================
  Hits           1054     1054           
  Misses          127      127           
  Partials         61       61

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[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

0.0% Coverage
0.0% Duplication