[Feature]: support timezone configure

[lida2003]

Requirements

• I have updated Configurator to the latest available version
• I did a search to see if there is a similar issue or if a pull request is open.

Is your feature request related to a problem?

• UTC time is not available in all regions #36

Describe the solution you'd like

1. add timezone multi-list box
2. initialize the box with current configured timezone
3. user can select the timezone where he/she fly the FPV
4. add a buttone to apply timezone

• change localtime instead of gmtime on OSD display #39

Related commands and zoneinfo see below:

daniel@daniel-nvidia:~/Work/OpenIPC-Adaptive-Link$ ls /usr/share/zoneinfo
Africa      Australia  Cuba     Etc      GMT+0      Iceland      Japan              MET      NZ-CHAT     PRC        SystemV    UTC           Zulu
America     Brazil     EET      Europe   GMT-0      Indian       Kwajalein          Mexico   Pacific     PST8PDT    Turkey     WET
Antarctica  Canada     Egypt    Factory  GMT0       Iran         leapseconds        MST      Poland      right      tzdata.zi  W-SU
Arctic      CET        Eire     GB       Greenwich  iso3166.tab  leap-seconds.list  MST7MDT  Portugal    ROC        UCT        zone1970.tab
Asia        Chile      EST      GB-Eire  Hongkong   Israel       Libya              Navajo   posix       ROK        Universal  zonenow.tab
Atlantic    CST6CDT    EST5EDT  GMT      HST        Jamaica      localtime          NZ       posixrules  Singapore  US         zone.tab
daniel@daniel-nvidia:~/Work/OpenIPC-Adaptive-Link$ ls /usr/share/zoneinfo/Asia/
Aden       Atyrau   Brunei      Damascus   Hebron       Jerusalem  Kolkata       Makassar      Phnom_Penh  Saigon         Tashkent  Ujung_Pandang  Yangon
Almaty     Baghdad  Calcutta    Dhaka      Ho_Chi_Minh  Kabul      Krasnoyarsk   Manila        Pontianak   Sakhalin       Tbilisi   Ulaanbaatar    Yekaterinburg
Amman      Bahrain  Chita       Dili       Hong_Kong    Kamchatka  Kuala_Lumpur  Muscat        Pyongyang   Samarkand      Tehran    Ulan_Bator     Yerevan
Anadyr     Baku     Choibalsan  Dubai      Hovd         Karachi    Kuching       Nicosia       Qatar       Seoul          Tel_Aviv  Urumqi
Aqtau      Bangkok  Chongqing   Dushanbe   Irkutsk      Kashgar    Kuwait        Novokuznetsk  Qostanay    Shanghai       Thimbu    Ust-Nera
Aqtobe     Barnaul  Chungking   Famagusta  Istanbul     Kathmandu  Macao         Novosibirsk   Qyzylorda   Singapore      Thimphu   Vientiane
Ashgabat   Beirut   Colombo     Gaza       Jakarta      Katmandu   Macau         Omsk          Rangoon     Srednekolymsk  Tokyo     Vladivostok
Ashkhabad  Bishkek  Dacca       Harbin     Jayapura     Khandyga   Magadan       Oral          Riyadh      Taipei         Tomsk     Yakutsk
daniel@daniel-nvidia:~/Work/OpenIPC-Adaptive-Link$ sudo ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
daniel@daniel-nvidia:~/Work/OpenIPC-Adaptive-Link$ ls -l /etc/localtime
lrwxrwxrwx 1 root root 33 11月  7 08:40 /etc/localtime -> /usr/share/zoneinfo/Asia/Shanghai

For OpenIPC firmware, which timezone is trimmed, following commands can be used.

$ echo "GMT-8" > /etc/TZ
$ export TZ=$(cat /etc/TZ)

Describe alternatives you've considered

Time sync with the configurator

Additional context

1. No Offset GMT Time Zones

Configuration	Description
GMT0	Greenwich Mean Time, no offset.
UTC0	Equivalent to GMT0, no offset.

2. Eastern Time Zones (UTC+X)
Eastern time zones are ahead of UTC, with a positive offset (+X).

Configuration	Offset	Example Regions
GMT-1	UTC+1 hr	Central European Time (e.g., France, Germany).
GMT-2	UTC+2 hrs	South Africa Standard Time.
GMT-3	UTC+3 hrs	Moscow Standard Time.
GMT-4	UTC+4 hrs	Dubai Standard Time.
GMT-5	UTC+5 hrs	Pakistan Standard Time.
GMT-6	UTC+6 hrs	Bangladesh Standard Time.
GMT-7	UTC+7 hrs	Thailand Standard Time.
GMT-8	UTC+8 hrs	China Standard Time (Beijing).
GMT-9	UTC+9 hrs	Japan Standard Time.
GMT-10	UTC+10 hrs	Australian Eastern Standard Time.
GMT-11	UTC+11 hrs	Solomon Islands Time.
GMT-12	UTC+12 hrs	New Zealand Standard Time.

3. Western Time Zones (UTC-X)
Western time zones are behind UTC, with a negative offset (-X).

Configuration	Offset	Example Regions
GMT+1	UTC-1 hr	Azores Standard Time.
GMT+2	UTC-2 hrs	Mid-Atlantic Standard Time.
GMT+3	UTC-3 hrs	Brasília Standard Time.
GMT+4	UTC-4 hrs	Atlantic Standard Time.
GMT+5	UTC-5 hrs	Eastern Standard Time (USA).
GMT+6	UTC-6 hrs	Central Standard Time (USA).
GMT+7	UTC-7 hrs	Mountain Standard Time (USA).
GMT+8	UTC-8 hrs	Pacific Standard Time (USA).
GMT+9	UTC-9 hrs	Alaska Standard Time.
GMT+10	UTC-10 hrs	Hawaii Standard Time.
GMT+11	UTC-11 hrs	Samoa Standard Time.
GMT+12	UTC-12 hrs	Baker Island Time.