v0.13.3

This is a bug fix release to fix a number of issues introduced in the v0.13 release.

Resolved issues:

* vendor: Replace github.com/jackpal/gateway with github.com/calmh/gateway (#3142, @calmh)
* lib/model: Leave temp file in place when final rename fails (#3146, @calmh)
* lib/model: Track puller creation times (#3145, @AudriusButkevicius)
* gui: Set CSRF stuff earlier (#3138, @calmh)
* cmd/syncthing: Correctly set, parse and compare modified time HTTP headers (#3165, @calmh)
* lib/util: Add secure random numbers source (#3178, @calmh)
* lib/upgrade: Prefer a minor upgrade over a major (#3163, @calmh)
* cmd/syncthing: Do not modify events (#3002, @AudriusButkevicius)
* lib/model: Fix wild completion percentages (#3102, @AudriusButkevicius)
* cmd/syncthing: Use API to generate API Key and folder ID (#3179, @calmh)
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