Add manual connection option

[haslinghuis]

• Have observed users clicking the connect button without any connection available making manual connection an option would fix most Failed to open serial port events. During this process port_handler has been optimized.
• manual optional is now optional - as most users would only use serial connection
• removes brain overload after refactoring some code in porthandler
• made currentPorts global simplifying code
• during development encountered some issues which are fixed in:
  Fix reset options #3932
  Fix virtual reboot and auto-connect #3933
  Fix AT32 detection #3935

[blckmn]

AUTOMERGE: (FAIL)

• github identifies PR as mergeable -> FAIL
• assigned to a milestone -> PASS
• cooling off period lapsed -> PASS
• commit count less or equal to three -> PASS
• Don't merge label NOT found -> PASS
• at least one RN: label found -> PASS
• Tested label found -> FAIL
• assigned to an approver -> PASS
• approver count at least three -> FAIL

[McGiverGim]

I don't understand. What is the problem with JQuery? I understand is old technology and if we can get rid of it, great. But remove it to go with plain javascript, does not seem a good option to me.
The idea was go to Vue (or any other technology that we decide and simplifies the code) but not to plain javascript.

[haslinghuis]

Agree Vue was adapted some time ago and thought this move was creating a path for further migration.

[haslinghuis]

@McGiverGim @chmelevskij please assist in getting this to use Vue as requested.

requesting new review

[haslinghuis]

Testing. Just a minor display issue. Need to hide that while rebooting.

EDIT: fixed in 70b68d8
EDIT 2: rebased on master

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

Do you want to test this code? Here you have an automated build:
Betaflight-Configurator-Android
Betaflight-Configurator-Linux
Betaflight-Configurator-Windows
Betaflight-Configurator-macOS
WARNING: It may be unstable and result in corrupted configurations or data loss. Use only for testing!

[nerdCopter]

3785b9f5
rm ~/.config/betaflight-configurator/

• clicking connect with no FC, does nothing; no errors, logs, nor console. 🚀
• toggling Enable manual connection mode properly add/removes manual Selection from drop-down and also shows/hides manual port field. 🚀
• flash & pseudo-setup unsolderd FC worked fine.
• moving from VTX tab to LED Strip tab, went to click on an item, and tab jumped back to VTX tab. most-likely unrelated to this PR and most likely a timing/promise issue.