Remove old distro's dependent code that has already reached EOL #365
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This PR removed code depending on Foxy, Galactic, and Iron, which have already reached EOL. Although it may be good idea to keep these codes because they were appropriately macro-switching, I want to suggest that removing them could improve maintainability and concentrate our development resources in the future.
For those who insist on using the older distributions, I have noted that they should be usable for v0.11.3 or earlier.
This PR will fix #333
@pojiro please share your thoughts!!
Just FYI, I have removed these codes found by grep, but are there any others left?