Nyall Dawson 36f68e4fc9 Add mechanism for temporarily disabling all network caching
to QgsNetworkAccessManager, and add a checkbox in the network
logger panel to allow users to temporarily disable the network cache

This can be VERY useful when debugging QGIS network activity, or when
using QGIS to test server side changes.

This is a transient setting only, and is forgotten as soon as QGIS
is closed. That's by design -- we don't want users to accidentally
leave this enabled and cause unnecessary server load.
2021-01-20 09:28:16 +10:00
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