This previously bypassed normalization because only the "value" part
of the internal exception message was normalized, the "module" part
can be invalid as well since it's derived from the original message.
Similar to Idc5514261e99d64222b86877dd0500d425a26988
Bug: T289358
Change-Id: I1ce09dd521eb80ba0d2fb6f84508a1a77d339496
Clear up a bunch of phpcs ignores by documenting many methods.
Also remove Scribunto_LuaError::setLineMap(), which has apparently never
been used since it was added in Ia51f439e.
Change-Id: I763bcdbc7edbbb8e4600495a03acca3439fc0ec9
