Hops Away implementation (#966)

* Initial Hops Away feature

* Generate our own hopsAway, comparing hopStart to hopLimit

* Remove import of hopsAway from device nodeInfo, as this only shows 0 when hopStart isn't included on packets (with this info, we can't differentiate between a node which is Hops Away but on old firmware, or nodes which are on new firmware but direct. Both are 0)

Check if hopStart is 0 but hopLimit is not 0, if true set hopsAway to -1.

Show nodes with hopsAway with -1 with a (!) appended to the RSSI details, to show this probably isn't true. (eg they are using old firmware)

Change the default of hopsAway to -1, until we know it is direct (0) or hops away (1+)

* tidy up: move from nested if else to when

* Revert Project_Default.xml

* Move hopsAway when block in to updateNodeInfo() block above it.

Move hopsAway var to end of NodeInfo Class.

Schema update due to change above.

* hopsAway now follows firmware implementation.
hopsAway now imported from radio (installNodeInfo)

* reformat

---------

Co-authored-by: andrekir <andrekir@pm.me>

app/src/main/java/com/geeksville/mesh/NodeInfo.kt

@@ -2,6 +2,7 @@ package com.geeksville.mesh
 
 import android.graphics.Color
 import android.os.Parcelable
+import androidx.room.ColumnInfo
 import androidx.room.Embedded
 import androidx.room.Entity
 import androidx.room.PrimaryKey
@@ -224,6 +225,8 @@ data class NodeInfo(
     var channel: Int = 0,
     @Embedded(prefix = "envMetrics_")
     var environmentMetrics: EnvironmentMetrics? = null,
+    @ColumnInfo(name = "hopsAway", defaultValue = "0")
+    var hopsAway: Int = 0
 ) : Parcelable {
 
     val colors: Pair<Int, Int>