Allow duplicate placeholders in engine strings

more ja.txt fixes

Add script to check engine locale files for problems

Remove string with duplicate placeholder in sk.txt Duplicate placeholders are not supported yet.

Fix incorrect string number for Slovak strings for King death

Support CJK fonts for sidFPS as well

Add CJK font support for sidAmmoCount

fix some of Wuzzy's rage

some ja.txt corrections

update ja.txt

Also report chat and added rooms in log

Fix hog can drop more than 2 s. mines if first one was dropped from utility, then stop using that utility Fixes bug #701.

Finish hedgewars-checker implementation

disable basic comment support 'cause lua is nuts

Create replay file, run engine, result from it and send it to the server. Not implemented: filtering of engine output.

Start checker implementation in rust

Fix silly loop

Add --protocol option to engine

change draw_thick_line iteration order to benchmark winner

Change Land2D::fill() arguments a bit

Fix ArcPoints never finishing

revert 2354264ab0b0

apply some codegolfing for dubious reasons

Use integral-geometry iterators to implement Land2D::draw_thick_line, remove no longer unused functions from Land2D