Allow factory suggestions to have parser context

[me4502]

This is a refactor to allow access to a ParserContext within the suggestion methods. This is required for any suggestions within the factory parser that are player-specific, such as suggesting properties for the currently held block in //set hand[layers=6] or whatever

[codecov]

Codecov Report

Merging #2236 (d6ce553) into master (6951e79) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##             master   #2236      +/-   ##
===========================================
- Coverage      9.20%   9.20%   -0.01%     
  Complexity     1038    1038              
===========================================
  Files           871     871              
  Lines         43653   43658       +5     
  Branches       4870    4870              
===========================================
  Hits           4019    4019              
- Misses        39453   39458       +5     
  Partials        181     181              

Impacted Files	Coverage Δ
...q/worldedit/command/argument/FactoryConverter.java	23.40% <0.00%> (-1.60%)	⬇️
...sk89q/worldedit/extension/factory/MaskFactory.java	38.46% <0.00%> (ø)
...xtension/factory/parser/mask/BlocksMaskParser.java	16.66% <0.00%> (ø)
...xtension/factory/parser/mask/NegateMaskParser.java	16.66% <0.00%> (ø)
...xtension/factory/parser/mask/OffsetMaskParser.java	13.33% <0.00%> (ø)
...on/factory/parser/pattern/RandomPatternParser.java	8.57% <0.00%> (ø)
...ctory/parser/pattern/RandomStatePatternParser.java	11.11% <0.00%> (ø)
...ctory/parser/pattern/SingleBlockPatternParser.java	50.00% <0.00%> (ø)
...rser/pattern/TypeOrStateApplyingPatternParser.java	4.16% <0.00%> (ø)
...q/worldedit/internal/registry/AbstractFactory.java	47.61% <0.00%> (-2.39%)	⬇️
... and 1 more

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