0972f55040 from #33229 broke manpage
generation, because the assumption that the last word in the line
containing the version number, was the version number, no-longer holds
for some binaries. i.e bitcoind.
This change:
1. Collects build artifacts in dedicated locations.
2. Allows running bitcoin-chainstate.exe with bitcoinkernel.dll directly
from the build tree on Windows.
the cmake build steps suggest a build/ directory, which breaks these
scripts. Additionally, in-tree builds are no longer allowed, so it makes
sense to update the code and the README accordingly.
With --skip-missing-binaries, instead of stopping the execution of
gen-manpages.py when a binary is not found, continue generating
manpages for the available binaries and skip the missing ones.
