Add mcl_sign support (fixes #330)

[bgstack15]

Please squash if you accept this pull request. This adds Mineclonia signs (mcl_signs) support based on the comments in the issue this (fixes #330). It was done in a lazy manner and does not loop over all possible signs that could exist if new woods be defined or additional mods, and just reuses the wood sign image.

Tested on MTG and Mineclonia worlds' maps.

[BuckarooBanzay]

a bit repetitive but works for me 👍

[coveralls]

Pull Request Test Coverage Report for Build 14501569459

Details

• 0 of 55 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.4%) to 27.399%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
mapobject/setup.go	0	55	0.0%

Files with Coverage Reduction	New Missed Lines	%
mapobject/setup.go	1	0.0%

Totals
Change from base Build 11784474570:	-0.4%
Covered Lines:	968
Relevant Lines:	3533

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💛 - Coveralls