Merge version 1.10.10:

lots of cleanup and maintenance work by kristaps@.
- move some main.c globals into struct curparse
- move mandoc_*alloc to mandoc.h such that all code can use them
- make mandoc_isdelim available to formatting frontends
- dissolve mdoc_strings.c, move the code where it is used
- make all error reporting functions void, their return values were useless
- and various minor cleanups and fixes

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