fix: parse irc tags with consecutive escapes

[iProdigy]

Pull request checklist:

• CHANGELOG.md was updated, if applicable

Description

When an irc tag has multiple escaped characters in a row, the current parseTagString function fails to see the 2nd \ due to the extra i++ (since the loop declaration already has i++ and the string replacement eats two characters)

Example: system-msg=DefectiveCloak\s\sgifted\sa\sTier\s1\ssub\sto\saliiscrying! (weird case where their display name has a trailing space)

[Felanbird]

@badges=subscriber/0,premium/1;color=#1E90FF;display-name=ItsVinc\s;emotes=80481:0-4;id=376529fd-31a8-4da9-9c0d-92a9470da2cd;login=itsvinc;mod=0;msg-id=resub;msg-param-months=2;msg-param-sub-plan-name=Dakotaz;msg-param-sub-plan=1000;room-id=11148817;subscriber=1;system-msg=ItsVinc\s\sjust\ssubscribed\swith\sa\sTier\s1\ssub.\sItsVinc\s\ssubscribed\sfor\s2\smonths\sin\sa\srow!;tmi-sent-ts=1528191154801;turbo=0;user-id=41174867;user-type= :tmi.twitch.tv USERNOTICE #pajlada :pajaW

before change:

after change:

Took an existing debug resub message and inserted a user with a trailing space, seems the literal \s is replaced with a literal space, which while annoying to see, is likely better than seeing a literal \s.

(or maybe I made a mistake in this rawMSG and this change works exactly as intended, tune in to find out).

[iProdigy]

yeah this PR doesn't add any trimming between words, just makes sure to convert all \s to spaces

[pajlada]

Added some tests and then reverted your fix, and saw the wrong behaviour you described 👍 Thanks for the fix!