Bugfixes and quant protection

FIX: ENUM segwit, fIncludeWitness

PoS protect redesign

RC4OK, 3 bugfixes

Set bech32_hrp to em

Major changes, need re-download blockchain

PoS protect release

v0.7.11emc

Several important bugfixes. Upgrade is strictly recommended.

emerDNS:
 - Improved logging
 - Optimized ENUMER for NAPTR only
 - Bugfix: Set "_" as a valid name symbol
STUN:
 - Improved code, removed randfiller
 - Refresh STUN server list
emerSSL:
 - Fixed minor bug in GUI cert generator with 0 as Serial prefix
Core:
 - Added entropy cache for speedup blockchain download
 - Added hard chepoints
 - Migrate to boost 1.76, qt5
Randpay:
 - Fixed false mempool rejection 2nd RP TX
 - Fixed false mainnet mempool rejection
 - Added randpay-test.sh
Contrib:
 - Added app icons and .desktop file for Linux systems
 - Updated build tool for native build ARM, MacOS x86 and Mac M1

Minor release. Upgrade is not required but recommended.

1. Rewritten PoS spam protection, so that it can delete headers in memory and ban less people.
2. Add PoS spam protection to testnet.
3. Disable address->name index by default (most people will not need this). May speed up blockchain download.
4. RPC: fix name_scan_address.
5. Update StunSrvList[701]. This is used to check your own IP.
6 PoW mining code is removed from release version, because some websites identify it as malicious miner. You can still activate this code in a debug version if you need to test things out.
7. It is now possible to enter safe mode by receiving an alert. You can disable this by -disablesafemode config option.
8. emerDNS: fixed dot bug in TXT, return EDNS0 for NOERR answers only.

Security release: fixes another bug in PoS spam filter. Upgrade is no…

…t necessary, but recommended.