1.1.0 preview (not complete) and with JS IR support

This is an extra release so that Atrium can be used with JS using the IR compiler backend.

Note that's not the final 1.1.0 version and that:

• it lacks the kotlin_1_3 extension but the corresponding expectation functions are already integrated into the normal module. Iin case you also switch from LEGACY to IR and were using the kotlin_1_3 extension, then search and replace the import statement. search import ch.tutteli.atrium.api.fluent.en_GB.kotlin_1_3 and replace with import ch.tutteli.atrium.api.fluent.en_GB
• it does not fix the backward-compatibility issues Jetbrains has introduces from LEGACY to IR -- in case you should see <unknown> (js: ...) in reporting, then it's due to the breaking change => I assume Atrium should still be usable in 99.99% of the cases