Fix Chat events for regular player chat.

[cartman-2000]

This fixes the events for normal player chat, and adds the isRich to the OnPlayerChatted event. Plugins that use the OnPlayerChatted would need to update.

[CLAassistant]

All committers have signed the CLA.

[Trojaner]

The OnPlayerChatted "rich" parameter has not been adapted on purpose, to keep backwards compatibililty.
The handler has been already fixed, as "tellChat" SteamCalls have been:
5f6671c
62cd8e8

(This PR wouldn't solve the encoding bug on chat, as it does not fix tellChat missing parameter)

[Trojaner]

For OnPlayerChatted we either need to create a new, additional event - or break many plugins.

Yes, the parameter needs to be added sooner or later