Bug: Hammer doesn't ignore specific characters inside text key value

[BonkManReturns]

Describe the bug

Placing symbols such as quotation marks inside the key value of various entities (In this case, a text value) results in the vmf crashing (In this case, it blamed line 37924 instead of the culprit, line 37918).

The vmf code, with the error happening to a prop_testchamber_sign in P2CE.

The crash message.

To Reproduce

Simply place quotation marks inside a text key value, such as the P2CE testchamber_sign sign_levelname key.

Issue Map

https://drive.google.com/file/d/1Gegw_9bgn-LACmqw34SB3zWCbsx4smx3/view?usp=sharing

Expected Behavior

Hammer should naturally escape these characters (Thanks to Erin for the explanation).

Operating System

Windows 10

[lvaness]

Duplicate of #60