Provide group read, write and execute permissions for /dev/dvb, otherwise
adapters will not be accessible from tvheadend.

Signed-off-by: Matthew Hagan <mnhagan88@gmail.com>

If config parameter is not set, tvheadend will bind to LAN IP address by default.
Fixes issue #16500 without requiring user modifications to config file. It's also more secure if firewall becomes disabled.

Signed-off-by: Marius Dinu <m95d+git@psihoexpert.ro>

Changes:
- Update to tvheadend git master branch,
  commit 2efe90cdcf
  dated 2021-11-16
- Removed patches that are not needed anymore.
- Add patch to ignore a ICONV test that runs at tvheadned startup.
  This test fails without "full language support" in OpenWrt,
  but tvheadend appears to run fine anyway.
- Descrambling needs libdvbcsa, a BUILD_PATENTED package.
  Control Word clients now depend on descrambling.
- Added options:
  - CCCAM client
  - RegEx library choice: POSIX (internal) / libpcre (more compatible) / libpcre2
  - Optimize for speed (-O3, LTO)
- FFMPEG is working again. Added options for transcoding, but commented-out.
  If anyone needs this, just uncomment, make menuconfig and build.
- Sort everything in a more logical order

Signed-off-by: Marius Dinu <m95d+git@psihoexpert.ro>

- Added menuconfig options:
  - TV sources and protocols: SAT>IP, IPTV, HDHomeRun
  - SoftCAM (3 options)
  - Image cache (default changed to OFF)
  - Trace debug option (default changed to OFF)
- Added menuconfig descriptions.
- Removed codecs.
- Made PIE option dependent on global OpenWRT PIE setting.
- Run as regular user, not root.
- Added USB hotplug script to change DVB tuners permissions.
- Fixed a first-start bug(?) that I encountered: admin account created but not saved.

Signed-off-by: Marius Dinu <m95d+git@psihoexpert.ro>

Tvheadend is a TV streaming server and recorder for Linux. Legacy
Makefile for tvheadend was used as a skeleton, but most of its parts
were rewritten or updated later.

Procd init script allows to set some configuration options (these are
commented out in default Uci config for documentation purposes) and is
written in a way that it puts only configuration that needs to be
persistent to main memory. EPG database which is large and updated
regularly is put to tmpfs (this can be disabled in config).

Signed-off-by: Jan Čermák <jan.cermak@nic.cz>