we must not use disk_cache

[ErwanMAS]

During my usage , many instances crashed , i was using disk cache .

the setting is here => Edit / Preferences / system / video sequencer / use_disk_cache

This was not design to be access by multiple process

And i add a safety on the memory cache size ,so all workers will not consume all RAM , if you have set a agressive value

[codecov-io]

Codecov Report

Merging #32 (fe540b8) into master (b350ae5) will decrease coverage by 0.20%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
- Coverage   99.79%   99.58%   -0.21%     
==========================================
  Files           1        1              
  Lines         477      481       +4     
==========================================
+ Hits          476      479       +3     
- Misses          1        2       +1     

Impacted Files	Coverage Δ
scripts/addons/parallel_render.py	99.58% <75.00%> (-0.21%)	⬇️

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