Update license in pull-tester and rpc-tests

Add missing copyright/license header where necessary
Build util and common before building server
Merge pull request #5112

071473c Build util and common before building server (jtimon)
Merge pull request #5121

214091d Update license in pull-tester and rpc-tests (Michael Ford)
MOVEONLY: Move CFeeRate and Amount constants to amount.o
MOVEONLY: Separate CTransaction and dependencies from core
MOVEONLY: separate CTxUndo out of core
MOVEONLY: Move script/compressor out of script and put CTxOutCompressor (from
core) with it
MOVEONLY: core.o -> core/block.o