Replace --max-absolute-fee by --max-mining-fee (#32)

It makes much more sense to consider only the mining fee, for the absolute fee check, as it is volatile and amount-independent. The service fee is in % and predictable.

The default value is equivalent as before (1% of the default `auto-liquidity`, given that the previous value of 2% included the 1% liquidity service fee). Previous option is deprecated and explicitly rejected.

buildSrc/src/main/kotlin/Versions.kt

@@ -1,6 +1,6 @@
 object Versions {
     val kotlin = "1.9.23"
-    val lightningKmp = "1.6.2-FEECREDIT-5"
+    val lightningKmp = "1.6.2-FEECREDIT-6"
     val sqlDelight = "2.0.1"
     val okio = "3.8.0"
     val clikt = "4.2.2"