bug#67767: 30.0.50; ERC 5.6: Add track integration to the nicks module

[J.P.]

v2. Make "normal"-face hash table local to server buffers and double as
cache for inserted `nicks' faces. "Pre-combine" generated `nicks' faces
with `erc-nicks-backing-face' via :include. Overload
`erc-button-add-button' NICKP param (internally) for conveying current
`erc-button--nick' object. Remove `match'-based combo faces from
`erc-track-faces-priority-list' and `erc-track-faces-normal-list'.
Change default of `erc-button-nickname-face' to new face for
distinguishing between button-applied and "speaker" faces.

0000-v1-v2.diff
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0001-5.6-Have-nick-faces-inherit-from-erc-nicks-backing-f.patch
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0002-5.7-Promote-normal-faces-in-erc-track.patch
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0003-5.7-Cache-shortened-channel-names-in-erc-track.patch
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0004-5.7-Add-erc-track-integration-to-erc-nicks.patch
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