pidgin/pidgin

Add support for the author-name-color property to PidginMessage and wire it up in PurpleMessage as well

Testing Done:
Joined a chat and verified names were colored properly as well as in im's.

Reviewed at https://reviews.imfreedom.org/r/744/
syntax: glob
.*.swp
.DS_Store
.flatpak-builder
*.pyc
*~
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subprojects/*/
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^build(.+)?\/
win32-install-dir(\.release)?
po\/pidgin\.pot$