Remove hard-coded colors and cleanup SVG icons

Also remove old filled icons pack, and rename the "light-thin" pack to just
"thin".

src/qml/Base/HButton.qml

@@ -10,6 +10,7 @@ Button {
     topPadding: spacing / 2
     bottomPadding: topPadding
     iconItem.svgName: loading ? "hourglass" : icon.name
+    icon.color: theme.icons.colorize
     enabled: ! loading
 
     onVisibleChanged: if (! visible) loading = false

src/qml/Base/HCheckBox.qml

@@ -38,7 +38,7 @@ CheckBox {
             anchors.centerIn: parent
             dimension: parent.width - 2
             svgName: "check-mark"
-            colorize: theme.controls.checkBox.checkIconColor
+            colorize: theme.controls.checkBox.checkIconColorize
 
             visible: scale > 0
             scale: box.checked ? 1 : 0

src/qml/Base/HIcon.qml

@@ -1,15 +1,16 @@
 import QtQuick 2.12
 
 HImage {
-    visible: Boolean(svgName)
-
     property string svgName: ""
     property int dimension: 20
 
+
+    visible: Boolean(svgName)
+    colorize: theme.icons.colorize
+
     source:
         svgName ?
-        ("../../icons/" +
-         (theme ? theme.preferredIconPack : "light-thin") +
+        ("../../icons/" + (theme ? theme.icons.preferredPack : "thin") +
          "/" + svgName + ".svg") :
         ""