Allow to instantiate HWEngine with different library binaries

Add possibility to instantiate HWEngine objects from QML, reorganize work with preview

Rename protocol_version to hedgewars_engine_protocol_version to ensure use of correct library

Move the static mines test (bug #96) to a separate folder to allow using all tests in tests/lua for release testing.

Add log note just in case pas2c does anything odd.

Explain those weird hexcodes in uGearsHedgehog

make pas2c function without haskell aborting if locale is C

Fix cluster bomb target practice counting clusters as "shots"

ACF1: Fix Lua error when hitting Attack after failing the rope challenge "difficulty" variable was falsely set to 0 in this case, but only 1 or 2 are allowed

0.9.25 release branch