add system.print()

[aspiers]

This ensures that contracts using system.print won't break,
and that there is some mechanism for outputting to the logs
and STDOUT. Test suites which wish to avoid this can stub
system.print, e.g.

system.print = function(msg)
end

or

function stubPrint()
  system.origPrint = system.print
  system.print = function(msg)
    printOutput[#printOutput + 1] = msg
    -- We don't have the table library
    -- table.insert(printOutput, msg)
  end
end

function showPrintOutput()
  system.origPrint("captured:")
  for i, line in pairs(printOutput) do
    system.origPrint(line)
  end
  system.origPrint("--------")
end

function assertOutputContains(pattern)
  for i, line in pairs(printOutput) do
    if string.match(line, pattern) then
      return true
    end
  end
  error("Output did not contain '" .. pattern .. "'")
end

function resetOutputCapture()
  printOutput = {}
end

[codecov]

Codecov Report

Merging #9 into develop will decrease coverage by 0.07%.
The diff coverage is 40%.

@@              Coverage Diff              @@
##             develop       #9      +/-   ##
=============================================
- Coverage      71.82%   71.75%   -0.08%     
  Complexity         2        2              
=============================================
  Files             98       98              
  Lines           2080     2085       +5     
  Branches         107      107              
=============================================
+ Hits            1494     1496       +2     
- Misses           510      513       +3     
  Partials          76       76

Impacted Files	Coverage Δ	Complexity Δ
core/src/main/java/ship/test/Athena.java	100% <100%> (ø)	0 <0> (ø)	⬇️
core/src/main/java/ship/test/AergoMock.java	27.27% <25%> (-0.51%)	0 <0> (ø)
core/src/main/java/ship/build/WebServer.java	72.22% <0%> (ø)	0% <0%> (ø)	⬇️

---

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