Disallow map section URI paths which are parents of subsequent map section URI paths

[hummeltech]

This has unexpected effects for map section URI values which are parent paths of subsequent map section URIs.

E.g. for:

[map0]
uri=/map1/

[map1]
uri=/map1/1/

[map2]
uri=/map2/2/

Only map0 and map2 would be served as the uri for map1 is a path under the uri for map0.

Also, for:

[map0]
uri=/ # or no uri specification at all

[map1]
uri=/map1/1/

[map2]
uri=/map2/2/

Only map0 would be served as the uri for both map1 and map2 are paths under the uri for map0.

This pull request stops these from being allowed in renderd.conf files.

Resolves #27

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 92.59259% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.52%. Comparing base (c4e3e62) to head (c4a1aa5).
⚠️ Report is 21 commits behind head on master.

Files with missing lines	Patch %	Lines
src/renderd_config.c	92.59%	2 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #486      +/-   ##
==========================================
- Coverage   81.54%   81.52%   -0.02%     
==========================================
  Files          24       24              
  Lines        5645     5689      +44     
==========================================
+ Hits         4603     4638      +35     
- Misses       1042     1051       +9     

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