PHP 7.4 20200221

[phil-davis]

This is code so far for supporting PHP 7.4

This PR is on top of #36999 which implements Guzzle6 for acceptance tests. That can help developers who have PHP 7.4 - they can run acceptance tests against some ownCloud system-under-test (ownCloud10 itself, or OCIS or...)

PR #36999 "Guzzle6 for acceptance tests" is now in master. I have rebased this PR.

There are a lot of adjustments to phpunit tests still to be done - but I think the actual run-time back-end works.

[codecov]

Codecov Report

Merging #37004 into master will increase coverage by 0.73%.
The diff coverage is 20%.

@@             Coverage Diff              @@
##             master   #37004      +/-   ##
============================================
+ Coverage     64.75%   65.48%   +0.73%     
- Complexity    19138    19301     +163     
============================================
  Files          1270     1223      -47     
  Lines         74912    71909    -3003     
  Branches       1329     1329              
============================================
- Hits          48507    47090    -1417     
+ Misses        26014    24428    -1586     
  Partials        391      391

Flag	Coverage Δ	Complexity Δ
#javascript	54.17% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	66.8% <20%> (+0.87%)	19301 <0> (+163)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Files/Cache/Cache.php	95.87% <ø> (-1.77%)	106 <0> (ø)
index.php	0% <0%> (ø)	0 <0> (ø)	⬇️
console.php	0% <0%> (ø)	0 <0> (ø)	⬇️
...AppFramework/Utility/ControllerMethodReflector.php	100% <100%> (ø)	10 <0> (ø)	⬇️
lib/private/DB/SQLiteSessionInit.php	0% <0%> (-100%)	4% <0%> (ø)
lib/private/DB/SQLiteMigrator.php	0% <0%> (-100%)	7% <0%> (ø)
lib/private/DB/AdapterOCI8.php	0% <0%> (-86.67%)	4% <0%> (ø)
...ivate/Files/ObjectStore/HomeObjectStoreStorage.php	0% <0%> (-86.67%)	8% <0%> (ø)
lib/private/Repair/SqliteAutoincrement.php	0% <0%> (-85.19%)	9% <0%> (ø)
...Builder/ExpressionBuilder/OCIExpressionBuilder.php	0% <0%> (-85.19%)	18% <0%> (ø)
... and 80 more

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[phil-davis]

Note:
litmus and webDAV problem with object __toString conversion exception - see #32670 (comment)

[phil-davis]

See #37101