Add legacy support via plugin

[soun059]

Add legacy in build config & nonce in scripts for outlook webview support.

Related: #143

[longsleep]

@soun059 please rebase this MR on master, to incorporate the latest changes.

[longsleep]

This now looks good from the change itself, please deal with the remaining comments and update the commit message to resemble somewhich which follos the 7 rules of a great commit messages:

• Separate subject from the body with a blank line
• Limit the subject line to 50 characters
• Summary in the present tense. Not capitalized.
• Do not end the subject line with a period
• Use the imperative mood in the subject line
• Wrap the body at 72 characters
• Use the body to explain what and why vs. how

Try to summarize the change and then give details why this change is needed. Also please do not include "lico" or any other implicitly clear information in the commit summary or description.

[soun059]

@soun059 please rebase this MR on master, to incorporate the latest changes.

Rebased this with latest pull from master.

[soun059]

This now looks good from the change itself, please deal with the remaining comments and update the commit message to resemble somewhich which follos the 7 rules of a great commit messages:

* Separate subject from the body with a blank line

* Limit the subject line to 50 characters

* Summary in the present tense. Not capitalized.

* Do not end the subject line with a period

* Use the imperative mood in the subject line

* Wrap the body at 72 characters

* Use the body to explain what and why vs. how

Try to summarize the change and then give details why this change is needed. Also please do not include "lico" or any other implicitly clear information in the commit summary or description.

Updated the commit message.

[longsleep]

I am still not happy with the commit message. Please be more precise in the summary and add details in the description without repeating the summary again.

[soun059]

I am still not happy with the commit message. Please be more precise in the summary and add details in the description without repeating the summary again.

Updated the commit description to substantiate more details.