NLSR version 0.4.3

Changes:

• breaking change Change NLSR to nlsr for various prefixes (Issue #4543)

Bug Fixes:

• Fix dry-run mode not working (Issue #4394)
• Fix convergence w/o content store (Issue #4430)
• Register router prefix to fix remote requests (Issue #4543)
• Fix build with clang-5.0 (Issue #4547)
• Avoid misaligned memory access (Issue #4609)