"not self.title" doesn't work because of "self.title = title or """

Co-authored-by: Matthias Schiffer <mschiffer@universe-factory.net>

This removes PKG_VERSION and PKG_RELEASE from most Makefiles, as the
value was never useful for Gluon packages; instead, PKG_VERSION is set
to 1 in gluon.mk.

It also removes two other weird definitions:

- gluon-iptables-clamp-mss-to-pmtu replicating the old PKG_VERSION logic
  from gluon-core, but without the fixed PKG_BUILD_DIR to prevent
  unnessary rebuilds
- gluon-hoodselector set GLUON_VERSION=3

Fixes: #2311

Avoid requiring gluon.wireless from gluon.platform, and requiring
gluon.platform from various other scripts.

Add a package for handling upgrade-scripts speific for the WAN radio
operation.

This way, the config mode interface can be removed seperately from the
core functionality to perform tasks on system upgrade. This can be
useful when the setup-mode is removed entirely for space preservation.

Set the ifname for the WAN radio (Private WLAN) to wanX, X being the
radio index.

All other radios created by Gluon already have their ifname defined
following this pattern.

Signed-off-by: David Bauer <mail@david-bauer.net>

Separate wireless-related helper methods from the util module to a
new wireless module. This keeps them separated, as the amount of
wireless helpers increased in the past, justifying a separate module.

This allows a user to enable WPA3-Personal and WPA2-WPA3-MM for the
private WiFi in case it is supported by the platform.

- CGI script and index.html are moved from gluon-web to
  gluon-config-mode-core, the script is renamed to 'config'
- gluon-web and gluon-web-model base views and i18n files are symlinked
  into the new path
- gluon-web-theme is renamed to gluon-config-mode-theme and installs
  directly into the new path
- all gluon-web-* models, controllers and views are moved into the new
  path

Allows to remove some redundant UCI lookups.

gluon-core: gluon.util: pass UCI cursor as argument to iterate_radios() instead of using local context