Pattern language changes for syntax highlight code thatwill be pr'd to Imhex's repo later today.

[paxcut]

• Better parser support for identifier types of variable definitions only.
• Fixed typo in parser_manager.cpp.
• Parser errors were overwriting preprocessor/lexer errors. Make sure they are all added.
• If ast fails to be created make sure that the parsed tokens are saved before returning.
• Change a variable to a more appropriate name in preprocessor and remove excluded location validation.
• Rearrange identifier type enumeration values to support value ordering of importance (bigger are more important types and preferred if choice can be made). Also removed types that were not identifiers.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 13.46154% with 45 lines in your changes missing coverage. Please review.

Project coverage is 24.80%. Comparing base (321947d) to head (c85643c).

Files	Patch %	Lines
lib/source/pl/core/parser.cpp	0.00%	14 Missing and 25 partials :warning:
lib/source/pl/pattern_language.cpp	37.50%	2 Missing and 3 partials :warning:
lib/source/pl/core/evaluator.cpp	50.00%	0 Missing and 1 partial :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #108 +/- ## ========================================== - Coverage 24.80% 24.80% -0.01% ========================================== Files 137 137 Lines 10029 10025 -4 Branches 5573 5567 -6 ========================================== - Hits 2488 2487 -1 - Misses 4932 4933 +1 + Partials 2609 2605 -4 ```

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