Give the icon themes better names

gpxsee.pro

@@ -488,7 +488,7 @@ TRANSLATIONS = lang/gpxsee_en.ts \
     lang/gpxsee_ko.ts
 
 macx {
-    RESOURCES += theme-unix.qrc
+    RESOURCES += theme-grayscale.qrc
 
     ICON = icons/app/gpxsee.icns
     QMAKE_INFO_PLIST = pkg/mac/Info.plist
@@ -508,7 +508,7 @@ macx {
 }
 
 win32 {
-    RESOURCES += theme-default.qrc
+    RESOURCES += theme-color.qrc
 
     QMAKE_TARGET_DESCRIPTION = GPXSee
     QMAKE_TARGET_COPYRIGHT = Copyright (c) 2023 Martin Tuma
@@ -552,7 +552,7 @@ win32 {
 }
 
 unix:!macx:!android {
-    RESOURCES += theme-unix.qrc
+    RESOURCES += theme-grayscale.qrc
 
     isEmpty(PREFIX):PREFIX = /usr/local
     maps.files = $$files(data/maps/*)
@@ -576,7 +576,7 @@ unix:!macx:!android {
 }
 
 android {
-    RESOURCES += theme-default.qrc
+    RESOURCES += theme-color.qrc
 
     HEADERS += src/GUI/navigationwidget.h
     SOURCES += src/GUI/navigationwidget.cpp