Add imerode|dilate, fillsinks Float versions. Add bwconncomp

[joa-quim]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 35.52632% with 294 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.91%. Comparing base (a982288) to head (1d39768).
⚠️ Report is 178 commits behind head on master.

Files with missing lines	Patch %	Lines
src/imgmorph/bwdist.jl	0.00%	124 Missing ⚠️
src/imgmorph/graydist.jl	34.83%	101 Missing ⚠️
src/lepto_funs.jl	64.59%	57 Missing ⚠️
src/imgmorph/cc2bw.jl	0.00%	9 Missing ⚠️
src/libleptonica.jl	66.66%	2 Missing ⚠️
src/utils_types.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1834      +/-   ##
==========================================
- Coverage   85.71%   84.91%   -0.80%     
==========================================
  Files         173      176       +3     
  Lines       25915    26326     +411     
==========================================
+ Hits        22213    22355     +142     
- Misses       3702     3971     +269     

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