(cherry picked from commit 088ca266)

(mvc/fieldtype) add immutable UniqueIdField, @fraenki just add UniqueIdField to your model and this one will autogenerate new unique identifiers for you

(cherry picked from commit 8c35f297)

Example (from @fraenki):
<field>
        <label>Tuning Options</label>
        <type>header</type>
</field>

(cherry picked from commit 95522e09)

(cherry picked from commit 504c0762)

(cherry picked from commit c5c70b93)

(cherry picked from commit 6bd9cdca)

(cherry picked from commit e9369b5c)
(cherry picked from commit 1fa499ac)

(cherry picked from commit 3c2aad98)

(cherry picked from commit 8902faf9)

(ui) html decode ui output (no execute) when fetching form data, closes https://github.com/opnsense/core/issues/898

(cherry picked from commit bd51937a)

(cherry picked from commit da71e1a0)

(cherry picked from commit ce4bb4e7)
(cherry picked from commit 1586ee02)
(cherry picked from commit 58c923b7)

(cherry picked from commit 571bdae6)

(cherry picked from commit 7bf795b1)

(cherry picked from commit 50e4df6c)

(cherry picked from commit 307d9238)

(cherry picked from commit 1d0ae146)

(cherry picked from commit 546dda2d)

(cherry picked from commit 874eceaf)

See: https://github.com/opnsense/lang
(cherry picked from commit e3a003c8)

(cherry picked from commit 7c80504e)

(cherry picked from commit e6ed1c4a)

(cherry picked from commit 7ac4ff52)
(cherry picked from commit 331d5a8f)

(cherry picked from commit 425b8146)

(cherry picked from commit 083ca3c8)

(traffic shaper) add advanced option schedule type for pipe, makes current default (wf2q+) explicit. related to https://github.com/opnsense/core/issues/505

(cherry picked from commit 6fbd2dcc)

(cherry picked from commit 1db247e7)

(cherry picked from commit c94515f6)

(cherry picked from commit b205780f)

(cherry picked from commit db254cb8)

https://github.com/opnsense/core/commit/2ba1c056046967b61c74ee100bfa52ad3da49e36#commitcomment-17217733

(cherry picked from commit aa0bee2f)

(cherry picked from commit 2ba1c056)

(cherry picked from commit 25485266)

(cherry picked from commit 7e239603)

(cherry picked from commit 470861be)

(cherry picked from commit 9fd6504d)

(cherry picked from commit 73fcb871)

(cherry picked from commit 08653da5)