feat: add option to show phone GPS location on map

app/src/main/java/com/geeksville/mesh/ui/components/IconButton.kt

@@ -0,0 +1,66 @@
+package com.geeksville.mesh.ui.components
+
+import androidx.annotation.DrawableRes
+import androidx.annotation.StringRes
+import androidx.compose.foundation.layout.size
+import androidx.compose.material.Button
+import androidx.compose.material.ButtonDefaults
+import androidx.compose.material.Icon
+import androidx.compose.material.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.scale
+import com.geeksville.mesh.R
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+
+@Composable
+fun IconButton(
+    onClick: () -> Unit,
+    @DrawableRes drawableRes: Int,
+    @StringRes contentDescription: Int,
+    modifier: Modifier = Modifier,
+    enabled: Boolean = true,
+) {
+    IconButton(
+        onClick = onClick,
+        drawableRes = drawableRes,
+        contentDescription = stringResource(contentDescription),
+        modifier = modifier,
+        enabled = enabled,
+    )
+}
+
+@Composable
+fun IconButton(
+    onClick: () -> Unit,
+    @DrawableRes drawableRes: Int,
+    contentDescription: String?,
+    modifier: Modifier = Modifier,
+    enabled: Boolean = true,
+) {
+    Button(
+        onClick = onClick,
+        enabled = enabled,
+        modifier = modifier.size(48.dp),
+        colors = ButtonDefaults.buttonColors(backgroundColor = MaterialTheme.colors.primary),
+    ) {
+        Icon(
+            painterResource(id = drawableRes),
+            contentDescription,
+            modifier = Modifier.scale(1.5f),
+        )
+    }
+}
+
+@Preview(showBackground = true)
+@Composable
+private fun IconButtonsPreview() {
+    IconButton(
+        onClick = {},
+        drawableRes = R.drawable.ic_twotone_layers_24,
+        R.string.map_style_selection,
+    )
+}