feat: add 'contact us' in the menu -> help submenu

[Keith-CY]

This PR adds an extra contact method via mail for users who
are not programmers and don't know GitHub.

A sub-menu named 'Contact Us' is added in "Menu -> Help" that
invokes a local mail client to send help request to
"neuron@magickbase.com"

Ref: Magickbase/neuron-public-issues#30

[Cedar67]

When the system email client program cannot be found, the popup window cannot be closed by click OK button.

[Cedar67]

The pop-up message does not display Chinese characters.

[Keith-CY]

When the system email client program cannot be found, the popup window cannot be closed by click OK button.

Cool, I think an extra button to copy our email could be added in the dialog, I'll update it tomorrow

[Cedar67]

When clicking Contact Us on a system with a mail client, the browser window pops up instead of opening the expected mail delivery template.

20220719-105049-HD.mov

[Keith-CY]

When the system email client program cannot be found, the popup window cannot be closed by click OK button.

Cool, I think an extra button to copy our email could be added in the dialog, I'll update it tomorrow

Copy mail address was added by 4485569

[Keith-CY]

When clicking Contact Us on a system with a mail client, the browser window pops up instead of opening the expected mail delivery template.

20220719-105049-HD.mov

The browser was set as the default application for handling an mail by operating system, I think there's no good way to check if it's a valid mail client, do you have any idea @yanguoyu

[yanguoyu]

When clicking Contact Us on a system with a mail client, the browser window pops up instead of opening the expected mail delivery template.
20220719-105049-HD.mov

The browser was set as the default application for handling an mail by operating system, I think there's no good way to check if it's a valid mail client, do you have any idea @yanguoyu

I think there's no more solution if users don't install an email app.
Providing our email address also resolves some problems. Maybe we should change the tips to Please copy the email address then send an email to us?

[Keith-CY]

When clicking Contact Us on a system with a mail client, the browser window pops up instead of opening the expected mail delivery template.
20220719-105049-HD.mov

The browser was set as the default application for handling an mail by operating system, I think there's no good way to check if it's a valid mail client, do you have any idea @yanguoyu

I think there's no more solution if users don't install an email app. Providing our email address also resolves some problems. Maybe we should change the tips to Please copy the email address then send an email to us?

Message was updated to include the text appended in the mail template.

[Cedar67]

Verified.