Discourage fee sniping with nLockTime
Qt: new icons

- flat and b/w icons seems to be the new trend
- support for HiDPI/retina
- change icon sizes
- fix assets-attribution.md
- removed unused icons
[Qt] the RPC Console should be a QWidget to make window more independent

- fix issue #5254
libbitcoinconsensus: Add pkg-config support
[Qt] fix missing plural form for a string in sendcoinsdialog

- this was reported on Transifex by pryds (Thank you!)
[Qt] change some strings to reflect name change to Bitcoin Core
[Qt] fix a translation that occurs 2 times but was a little different
Test unexecuted OP_CODESEPARATOR

OP_CODESEPARATOR is an actual executed instruction, not a declarative
thing, so if it's wrapped in an OP_IF it can be turned off.

Using this to implement Rivest's Paywords is left as an exercise for the
reader.
Revised translation process doc
Make IsSuperMajority a standalone function
Move remaining CBlockIndex methods to chain.cpp
Add /rest/headers
Fix download link for gitian builds
Merge pull request #5357

5ea3bc0 Move remaining CBlockIndex methods to chain.cpp (Pieter Wuille)
9dcd524 Make IsSuperMajority a standalone function (Pieter Wuille)
Merge pull request #5471

164a45f Fix download link for gitian builds (BtcDrak)
minor fix on script test data docs
Merge pull request #5482

87e8e1c minor fix on script test data docs (Manuel Araoz)
Remove references to X11 licence
Merge pull request #5444

f676c80 Add /rest/headers (Pieter Wuille)
Merge pull request #5219

31aac02 Qt: new icons (Jonas Schnelli)