Misc parser issues with various non-grade related numbers parsed as grades

[bettyruntianwang]

For example for course PPG200H1:
The prereq string is: ECO100Y1 / ECO101H1&ECO102H1 / ECO105Y1
the ECO102H1 is being parsed as a grade.
Additional note regarding this: if we recognize '&' as a "andSeparator", there is an issue with the interpretation of the prereq.
This is prereq is saying ECO100 or (ECO101 and ECO102) or ECO105, however, the parsing will pick this up as (ECO100 or ECO101) and (ECO102 or ECO105).

For course CLA303H1 (and others):
The prereq string is: CLA160H1 + 1 of CLA204H1/CLA219H1/CLA232H1/CLA233H1/CLA236H1/CLA260H1
The "1" is "+1" is being parsed as a grade.

For course SOC349H1 (and others):
The prereq string is: SOC201H1, SOC202H1, SOC204H1 & 1.0 FCE from SOC251H1/SOC252H1/SOC254H1
The "1.0" in FCE is parsed as a grade