Synchronize rate limit variables and limit PlayerMsg hook

Synchronize the rate limit and apply it on the PlayerMsg hook to eliminate any risks of desyncs caused by the engine. This makes sure that the rate limiter actually have an effect on custom chats implemented in Lua, since without it, Lua writers are going to be forced to re-implement a mechanism that the engine would've otherwise already provided.

Fixes #1289 (closed)

merged

mentioned in commit ec9e9505

changed milestone to %2.2.14

added Enhancement Lua labels

added Changed behavior label