Refactor: libcrmcommon: separate options-related code into own files

... to keep crm_internal.h and utils.c from being massive dumping grounds.

Before:

318 include/crm_internal.h

1181 lib/common/utils.c
1499 total

After:

238 include/crm_internal.h
109 include/crm/common/options_internal.h
700 lib/common/utils.c
513 lib/common/options.c

1560 total