build: Version bump to 0.9.99, disable IS_RELEASE

`master` is not a release. Use the same convention as before and label
these intermediate builds as x.x.99.
Merge pull request #3784

dc01ba7 Fix coin control sorts date as text (Cozz Lovan)
Bitcoin is running fine...

When bitcoind can't bind, bitcoin server (or Bitcoin Core Daemon) is probably already running. Add the missing word "server". Bitcoin itself is definitely running ;-)

Add _(...) so the string can be localized.

I apologize for such trivial changes, learning github interface.
Clarify the error message when unable to bind to port
Merge pull request #3798

2d2d8fa Clarify the error message when unable to bind to port (paveljanik)
094eeff Bitcoin is running fine... (paveljanik)
Fix null pointer in IsTrusted()