developer-tools-template: allow "select all" for "rendered"

[ildar170975]

Breaking change

Proposed change

Currently we cannot quickly select all text in a "rendered" panel like this:
1.Select any text.
2.Press "Ctrl-A" to get all result text selected.
Instead all other labels (except a text in codemirror) get selected.

This fix allows the described scenario.
It contains:
-- disabling a user select a "view-wide";
-- enabling a select for the "rendered" panel;
-- (seems to be needed for iOS Companion app) setting user-select: initial for a .edit-pane .card-content part.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[ildar170975]

I am honestly not sure if we still need that extensions like

-ms-user-select
-webkit-user-select
-moz-user-select

but they are present in other places of Frontend so I decided to follow a trend.
Also, I noticed that:
-- in some source files only user-select is used w/o extensions;
-- is some source files the user-select is present before other extensions;
-- is some source files the user-select is not present at all, only extensions are used.
Hope someone more experienced will say if it is properly or wrong.

[MindFreeze]

We don't need the prefixes. Removing -webkit-user-select will impact some old iphones but it's 5S and older from what I can find so it should be ok

[ildar170975]

We don't need the prefixes

Shall I remove extensions then?

[MindFreeze]

yes, please