Overhauled and dropped packet db (#2263)

Adds support for a lot of missing clients and features almost all clients from 2016 and 2017
clientinfo.xml's version value will be ignored from now on
By setting PACKETVER the server will configure everything else on it's own from now on
Dropped is_clientver script command
And a lot more

.travis.yml

@@ -34,7 +34,6 @@ script:
   - ./configure $CONFIGURE_FLAGS
   - make clean
   - make server
-  - 'echo packet_db_ver: $PACKETDBVER >> db/import/packet_db.txt'
   - ./map-server --run-once
 
 env:
@@ -44,7 +43,6 @@ env:
     - DB_NAME="ragnarok"
     - DB_USER="ragnarok"
     - DB_PASS="ragnarok"
-    - PACKETDBVER=45
   matrix:
     - CONFIGURE_FLAGS="--enable-prere=no --enable-vip=no --enable-buildbot=yes"
     - CONFIGURE_FLAGS="--enable-prere=yes --enable-vip=no --enable-buildbot=yes"