MikroTik RB750 Router Firmware 6.18

Fixes:
- SSTP - Report TLS encryption as well
- Safe Mode - Do not allow user with less permissions to disrupt active safe mode
- Console - Print command does not try to reuse item numbers assigned by previous invocations of 'print' when doing 'print where' or 'print follow', items are numbered consecutively starting from '0'
- Console - Fix compact export of some partially modified configuration values
- API -Use the same syntax for property values as is used in 'print detail' output, with the exception of numbers, that are not shown with suffixes (K/M/G/T or bitrate) and are not contracted or separated into digit groups, and "yes"/"no" values that continue to be reported as "true"/"false"
- Console - Show internal numbers in the form returned by 'find' (like 9A0F) instead of "(unknown)" when configuration refers to deleted items. This change also applies to API
- IPSec - Fix addition of default policy template
- Console - Values of type 'nil' were returning 'nil' as result of most operations. Now it compares less than all values except 'nil' and 'nothing', and compares unequal to all values except 'nil'. This was changed to make 'print where' and 'find where' more useful
- L2TP - Fixed problem on CCR where server responded with wrong source address
- Console Export - Put quotes around item names that start with a digit
- SNTP Client - Added support for dns lookup of ntp servers
- Console - When exporting to file, use name ending in '.in_progress', and rename when export finishes
- Bridge setups sometimes could crash on CCR devices
- Fixed port flapping in 1G mode on sfp-sfpplus1 on CRS226
- Fixed SXT ac model losing it's interface if changing regulatory settings in "routerboard" menu