handling special bearing format + lower/upper casing + tests on invalid input

[naronchen]

#7489

In addition addressing casing and special strings, I added tests for out-of-bound numbers/possible invalid inputs.

Couple observations:

1. incomplete bearing works if just missing numbers

N45E // returns 45 degree
N45:30E // returns 45.5 degree

these work as treating the missing sections as 00

2. ignores invalid symbols/numbers

N45:00@!$:00 // returns 45 degree
N45:0030:00 // returns 45.5 degree

3. allows first number to have negative sign but return ParseError.MathematicOperationFoundButIsNotAllowed for negative sign being on other numbers (this has to do with how Parser.isMathematicOperation is written, it skips the first element)

N-45:00:00 // returns 315 degree
N45:00:-30 // returns ParseError

4, allows numbers bigger than 90 to occur (tests added in this pr)

N100:00:00E // returns 100 degree

The parseAndProcessTokens implementation is relatively loose, which seems acceptable to me. Let me know if any behavior is unexpected.