[cv6] Core 1.2.0 RC 3

Core AddOn which from now on, (nearly) all my AddOns will require.

Besides Icon handling and Assset Upload some other minor thing that I share between my AddOns.

Mostly this is related to Font Awesome handling. See Edit Option Group as Demo.

Also see pictures whats inside.

New Resource Icon like this resource has, means, it needs this Core Addon.

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Some more shared functions added to the core. (indexale trait and template macros).

No need to upgrade, if no AddOn requires the upgrade of the core. The next upcoming index will need this version.

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• Messages Template for Admin

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My Core AddOn now as first with 2.3 compatibility, and requires also XF 2.3

Don't update until all my AddOns that you use, have the XF 2.3 compatible version.

Replaces XF Core FontAwesome Input fields with my Preview Version.

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Small bug fixes
additional new phrases

You only need to update, if a depending AddOn requires this.

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