[Wallet] Watch-only fixes
build: fix dynamic boost check when --with-boost= is used
build: fix qt test build when libprotobuf is in a non-standard path
Merge pull request #5073

d5fd094 build: fix qt test build when libprotobuf is in a non-standard path (Cory Fields)
a7d1f03 build: fix dynamic boost check when --with-boost= is used (Cory Fields)
Merge pull request #4937

ccca27a [Wallet] Watch-only fixes (Cozz Lovan)
Typo in test
Merge pull request #5080

e21b2e0 Typo in test (Luke)
Add coinbase commitments

This provides infrastructure for soft-forking bitcoin to include extra per-block committed data in transactions separate from the coinbase, so that Merkle proofs of these commitments do not have to include the entire coinbase transaction. This is accomplished by means of anyone-can-spend outputs in the coinbase which are spent COINBASE_MATURITY blocks later by the miner who finds the block, embedding the block's commitment in an OP_RETURN output of that spending transaction.

Includes one such commitment with no attached validation rules, suitable for document time-stamping, merged mining, and other free-form miner-committed data applications.
Add 'budget' field to getblocktemplate which reports required coinbase outputs other than the miner payout.
Update CBlock::CURRENT_VERSION to 3, a vote for coinbase commitments.