gen_data.pl generates wrong data.sql for Oracle in Zabbix 5.0

Steps to reproduce:
1. Run make dbschema, cd to database/oracle
2. Load schema.sql and images.sql with sqlplus as described in the manual
3. Log in with sqlplus, then from sqlplus command prompt:

set echo on
whenever sqlerror exit sql.sqlcode;
@data.sql

Result:

SP2-0341:
line overflow during variable substitution (>3000 characters at line 3)
...
...
ERROR at line 1:
ORA-02291: integrity constraint (ALEXK50T.C_ITEMS_5) violated - parent key not found

Find a line which inserts record for item with id 31055 (for Zabbix 5.0.4rc1). It has two problems:
1. The field param starts with concatenation operator "||".
2. The line is too long for sqlplus.

gen_data.pl has a special processing for long fields which is used for media types. This processing generates wrong SQL lines for items.