implement basic land bordering

Start outlining some core engine stuff

Pas2C: Fix data types of Trunc and Ceil

oups getter should have it too

- Move hedgewars-engine into lib-hedgewars-engine - Add command-line hedgewars-engine utility to use engine as standalone app

ignore whitespace/case by default to reduce false positives

fix texturing and add a theme loading option to land_dump

requires bash

Some minor fixes in de.txt

Add nemo's script to check for outdated engine translations with some adaptations

implement basic land texturing

Introduce FIX_STRINGA, use it fpcrtl_pos

Add TODO in ru.txt for reviewing all 04:XX strings

Add Russian translations in ru.txt

fix mapgen

save edges_count

Some refactoring of qmlfrontend. It now shows land preview generated by hedgewars-engine

Make hedgewars-engine crate produce shared library, implement some basics

Fix some warnings here and there, remove unwelcomed code

start loading theme textures

make fill point asserts persistent

a bit more simplification without an apparent performance gain

seems like about 25% speedup in land filling

workaround for the freepascal bug courtesy of koda

add more point operators

Update frontend russian translation

pull land into collision detector

Start working on frontend to rust engine rewrite

fix tangents

fix ray construction