BF: Print errors to stdoutFrame

[dvbridges]

Trackback error messages were starting on the StdOutFrame and finishing
on the console. Also, an error occured randomly causing psychopy to crash.
The crash would happen when printing whilst a traceback was printed.
With this fix, the crash has not reoccurred.

[coveralls]

Coverage decreased (-0.005%) to 48.925% when pulling 812efbb on dvbridges:printErrors into 55b2a41 on psychopy:master.

[codecov-io]

Codecov Report

Merging #2594 into master will decrease coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #2594      +/-   ##
==========================================
- Coverage   44.21%   44.19%   -0.03%     
==========================================
  Files         234      234              
  Lines       41597    41599       +2     
  Branches     7192     7193       +1     
==========================================
- Hits        18394    18386       -8     
- Misses      21240    21247       +7     
- Partials     1963     1966       +3

Impacted Files	Coverage Δ
psychopy/app/builder/builder.py	49.72% <0%> (-0.07%)	⬇️
psychopy/data/base.py	73.36% <0%> (-0.88%)	⬇️
psychopy/visual/window.py	66.43% <0%> (-0.69%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 55b2a41...812efbb. Read the comment docs.