Cache DBFile::exists() and reduce calls to file_exists()#388

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emteknetnz wants to merge 1 commit intosilverstripe:1from creative-commoners:pulls/1.5/less-file-exists

+137-5

Commits on Apr 15, 2020

NEW Add ReadOnlyCacheService to cache read-only calls to DBFile::exists(). Other small optimisation tweaks.
emteknetnz
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