- change api method listInstallableRuleset to listRulesets
- add api method getRuleset
- add api method setRuleset
- change api method toggleInstalledRuleset to toggleRuleset
- fix reload action on multiselect

just a pattern that returns from time to time, encapsulated into a new method so we can remove some code.

PR: https://forum.opnsense.org/index.php?topic=2090

o $g['theme'] usage converted
o $g['language'] usage zapped
o globals.inc removed

"device polling" changes also require a reboot

The changes won't happen until the interface is re-configured, just like for the other settings.

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(legacy) firewall_rules.php redirect to correct page for "Block bogon networks", closes https://github.com/opnsense/core/issues/713

Long story short: we don't want contrib code inside src/opnsense/contrib
so a few things need to be shuffled.  First pass is moving the current
contrib stuff to the same location instead and migrating the non-code
tzdata file.