Fix edge cases in `forLoop` rule

[calda]

This PR fixes several edge cases in the forLoop rule that I missed in #1490.

This PR also adds options to:

1. not convert anonymous forEach closures to for loops
2. convert single-line forEach closures to multi-line for loops

[codecov[bot]]

Codecov Report

Merging #1494 (dec6c4d) into develop (1291697) will increase coverage by 0.00%. The diff coverage is 99.46%.

@@            Coverage Diff            @@
##           develop    #1494    +/-   ##
=========================================
  Coverage    95.11%   95.11%            
=========================================
  Files           18       18            
  Lines        20821    20950   +129     
=========================================
+ Hits         19803    19926   +123     
- Misses        1018     1024     +6     

Files Changed	Coverage Δ
Sources/ParsingHelpers.swift	96.83% <98.24%> (+0.03%)	:arrow_up:
Sources/OptionDescriptor.swift	98.58% <100.00%> (+0.02%)	:arrow_up:
Sources/Options.swift	95.71% <100.00%> (+0.03%)	:arrow_up:
Sources/Rules.swift	98.41% <100.00%> (+0.01%)	:arrow_up:

... and 2 files with indirect coverage changes

[calda]

Rebased on top of the latest develop commit