generate a build info class with version property

[jenschude]

Summary

Generates a BuildInfo class file with the version of the library

Description

At the moment the SyncSolutionInfo file is updated by a task which uses ant to replace a placeholder with the actual build version number.

By generating a class file before the compilation step we can ensure that this file is always there and holds the version of the package. So the error prone pattern matching can be dropped.

[codecov-commenter]

Codecov Report

Merging #961 (ec3ee88) into master (feec854) will not change coverage.
The diff coverage is n/a.

❗ Current head ec3ee88 differs from pull request most recent head 9e36697. Consider uploading reports for the commit 9e36697 to get more accurate results

@@            Coverage Diff            @@
##             master     #961   +/-   ##
=========================================
  Coverage     99.12%   99.12%           
  Complexity     2690     2690           
=========================================
  Files           225      225           
  Lines          7206     7206           
  Branches        450      450           
=========================================
  Hits           7143     7143           
  Misses           31       31           
  Partials         32       32           

Impacted Files	Coverage Δ
...ercetools/sync/commons/utils/SyncSolutionInfo.java	100.00% <ø> (ø)