Fix wrongly parsed arguments in @Query

[mqus]

Fixes the issue (interpreting commas as parts of the inserted argument) by narrowing down the regex to only include letters, numbers, . and _.

For github: fixes #223 (NOT 224, that was a typo, I'll update the commit message)

[codecov]

Codecov Report

Merging #322 into develop will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #322   +/-   ##
========================================
  Coverage    81.55%   81.55%           
========================================
  Files           57       57           
  Lines         1475     1475           
========================================
  Hits          1203     1203           
  Misses         272      272           

Flag	Coverage Δ
#floor	81.55% <100.00%> (ø)
#floor_generator	80.97% <100.00%> (ø)

Impacted Files	Coverage Δ
...enerator/lib/processor/query_method_processor.dart	100.00% <100.00%> (ø)

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[vitusortner]

Awesome, thanks 👍